Every dollar spent on a search that doesn’t convert is a dollar lost. If you’re running Google Ads without a solid negative keywords strategy, you’re almost certainly throwing money away on irrelevant searches, low-intent traffic, and competitor poaching.
Negative keywords are one of the fastest ROI improvements you can make to a Google Ads account. Yet most businesses ignore them, or set them up once and forget them. That’s leaving thousands on the table.
Here’s what you need to know to stop wasting money and start winning only the searches that matter.
What Are Negative Keywords and Why They Matter
A negative keyword tells Google: “Don’t show my ad when someone searches for this term.” It’s a filter. It’s a gatekeeper. It’s the difference between a tightly controlled, high-performing account and a bloated budget drain.
Without negative keywords, your ads show for searches that are:
- Completely off-topic (someone searching “free” when you charge money)
- Competitor-driven (someone searching your competitor’s name)
- Intent-misaligned (someone looking for advice, not to buy)
- Job application searches (people looking for work, not your service)
Each of these costs you money and destroys your Quality Score. Over time, that wrecks your ROI.
The businesses we see with the highest Google Ads profitability all have one thing in common: a massive, actively maintained negative keywords list. Not 10 negatives. Not 50. Hundreds. Sometimes over 1,000. It’s not glamorous work, but it’s the foundation of profitable advertising.
The Three Levels of Negative Keywords
Google Ads gives you three match types for negative keywords, just like regular keywords. Understanding the difference between them is critical to building an effective strategy.
Broad Match Negative Keywords
A broad match negative keyword blocks your ad from showing whenever any part of the search term contains your negative keyword. It’s the widest net.
Example: If you add “-free” as a broad match negative, your ad won’t show for “free consultation,” “free trial,” “free legal advice,” or anything containing “free.”
Use this for: High-volume, obvious mismatches. Words that are almost always bad for your business. “-free” for a paid service. “-job” for a service business. “-DIY” if you don’t serve DIY customers.
Warning: Be careful with broad match negatives. They can block good searches too. “-real” would kill “real estate legal services” for an attorney, even though that’s a qualified search.
Phrase Match Negative Keywords
A phrase match negative keyword blocks searches that contain your exact phrase in that exact order.
Example: If you add “-how to” as a phrase match negative, your ad won’t show for “how to fix a leaky faucet” or “how to install drywall.” But it will still show for “best ways to fix a leaky faucet” (phrase not in that order).
Use this for: Specific intent patterns that don’t match your audience. “-how to” if you’re B2B. “-cost of” if you sell premium services. “-near me” if you only serve one location or region.
Exact Match Negative Keywords
An exact match negative keyword blocks searches that exactly match your keyword.
Example: If you add “-[plumber near me]”, your ad only blocks that exact search. “Plumber near me now” would still show your ad.
Use this for: Precise, high-intent mismatches you’ve identified in your search terms report. This is the most surgical approach to blocking unwanted traffic.
Where to Find Keywords You Should Exclude
The best negative keywords come from your actual search data. You don’t guess them. You find them. This is detective work, and it pays off big.
The Search Terms Report
Log into your Google Ads account. Go to Keywords > Search Terms. This shows every search someone actually typed that triggered your ads.
Scan this report weekly. Look for:
- Branded searches (your competitor’s name, their product name, their company)
- Intent mismatch (“how to” searches, educational searches, questions)
- Price sensitivity (“cheapest,” “free,” “discount,” “coupon,” “budget”)
- Job searches (“jobs hiring,” “now hiring,” “career,” “employment”)
- Geographic mismatches (locations you don’t serve or have no interest in)
- Service mismatch (services you don’t offer or market)
For every search you find that you don’t want, add the closest negative keyword at the appropriate match type. Over weeks, this becomes your proprietary negative list that competitors don’t have.
Competitor Monitoring
If you see searches for your competitor’s name, add them as negatives. You don’t want to pay for traffic searching specifically for them.
Example: If you’re a digital agency and someone searches “HubSpot partner,” that’s intent for HubSpot’s ecosystem. You probably don’t want to pay for that traffic. Add “-HubSpot” as broad or phrase match.
This is especially important in competitive verticals where bidding on competitor names is common. Protect your budget by excluding these searches.
Industry Keyword Tools
Use Semrush, Ahrefs, or Google Keyword Planner to research your industry. Look for high-volume keywords you don’t want to rank for or spend money on.
Example: A tax accountant might add “-tax resolution” or “-irs audit defense” if they don’t offer those services. Why? Because people searching those terms have specific, narrow problems. If you can’t solve them, you’re wasting money on clicks you can’t convert.
Your Own Exclusion Criteria
Think about your ideal customer. Then think backwards. Who do you NOT serve? Build a negative list from these exclusions.
- Do you only work with businesses over a certain size? Add “-freelance,” “-solopreneur,” “-startup”
- Do you only serve one industry? Add competing industries to your negatives
- Do you have geographic limits? Add states and cities you don’t serve
- Do you have service limits? Add services you don’t offer or market
Build a master negative keywords list from these exclusions. This becomes your foundation that carries forward into every campaign and saves you money from day one.
Building a High-Performance Negative Keywords Strategy
Here’s the framework we use for Lukrah clients that consistently improves ROI by 20-40%.
Tier 1: The Core Negative List (Start Here)
Start with a foundational list of 50-100 negatives that apply to all your campaigns. These are the obvious mismatches:
- “-free” (unless you want free-tier customers)
- “-cheap,” “-cheapest,” “-discount,” “-coupon” (unless budget is your market)
- “-how to” (unless you’re educational or DIY)
- “-jobs,” “-hiring,” “-employment,” “-career” (unless you’re recruiting)
- “-near me” (if you don’t serve local or nearby customers)
- “[Competitor name]” at exact or phrase match (all your competitors)
You apply this list to all campaigns, then add campaign-specific negatives on top. This two-tier approach is faster than building unique lists from scratch.
Tier 2: Campaign-Specific Negatives
Each campaign targeting a different service, product, or market should have its own negative list.
Example: A plumbing business runs three campaigns:
- Residential plumbing (add “-commercial,” “-industrial,” “-municipal”)
- Commercial plumbing (add “-residential,” “-emergency,” “-24-hour”)
- New construction plumbing (add “-repair,” “-emergency,” “-same-day”)
This ensures each campaign only gets relevant clicks and reduces wasted spend on irrelevant traffic.
Tier 3: Maintenance and Iteration
Every 2-4 weeks, review your Search Terms Report. Find new negatives. Add them. Watch Quality Score climb and cost-per-click fall.
This is not a “set it and forget it” game. The best accounts have someone reviewing and adding negatives weekly. It’s a discipline that pays off exponentially.
Red Flags That You Need More Negatives
If your Google Ads account shows any of these signs, you’re leaking money and need a negative keywords audit:
- Quality Score below 6/10: Your ads are showing for irrelevant searches. More negatives will help raise it.
- CTR is high but conversion rate is low: You’re getting clicks from the wrong people. Negative keywords will fix this mismatch.
- Cost per conversion is rising: Competition or relevance drift. Review your Search Terms Report immediately.
- Impression share high but conversions flat: You’re showing for too many searches. Tighten your negatives list now.
If you’re seeing any of these issues, it’s time to audit your Google Ads strategy and negative keywords list.
Common Mistakes to Avoid
Adding Negatives That Block Good Searches
This is the #1 mistake. Someone adds “-free” and blocks “freelance consultant,” which was actually converting well.
Solution: Use phrase or exact match instead of broad match when you’re uncertain. Test before rolling out to the entire campaign.
Ignoring Long-Tail Negatives
The big, obvious negatives catch 70% of the bad traffic. But the last 30% comes from weird long-tail searches. Those still cost money.
Solution: Make it a habit to scan Search Terms weekly. Find the 3-5 oddball searches each week. Add them as negatives. These accumulate into significant savings over time.
Not Communicating Negatives Across Accounts
If you have multiple Google Ads accounts (multiple brands, regions, etc.), each one discovers negatives independently. You’re learning the same lessons 5 times.
Solution: Maintain a master negative list shared across all accounts. It accelerates learning and prevents duplication of effort.
Forgetting to Exclude Your Own Brand
This one’s subtle. If someone searches “[Your Brand] review” or “[Your Brand] complaints,” do you want to pay for that click?
Usually no. They’re already investigating you. They’ll find you organically. Add your brand name and variations as negatives if your organic presence is strong.
Frequently Asked Questions
How many negative keywords should I have?
Start with 50-100 at the account level. Mature, high-performing accounts often have 500 or more. There’s no upper limit. More is usually better, as long as they’re relevant and actively maintained.
Should I use negative keywords or just better targeting?
Both. Negative keywords are a filter on top of your keyword targeting. Use them together for the best results and maximum control.
Do negative keywords affect Quality Score?
Indirectly, yes. By blocking irrelevant searches, your click-through rate and conversion rate improve, which improves Quality Score over time.
Can I add negative keywords at the ad group level?
Yes. Ad group negatives are more specific than campaign negatives. Use them for fine-tuning within a campaign and targeting specific audiences.
How long does it take to see ROI improvement?
Immediately. The moment you add a negative keyword that blocks a bad-intent search, you stop paying for it. The ROI improvement compounds as you add more over weeks and months.
Stop Wasting Money on the Wrong Searches
The difference between a $10,000/month ad account and a $10,000/month account that actually generates revenue often comes down to negative keywords. It’s not sexy. It’s not algorithmic. It’s just discipline and consistent maintenance.
Every week, spend 15 minutes in your Search Terms Report. Find the searches you don’t want. Add them as negatives. Over a few months, you’ll have built a fortress that keeps low-intent, low-value traffic out and lets qualified leads in.
If you’re managing multiple campaigns or want help auditing your negative keywords strategy, contact Lukrah. We’ve helped agencies and in-house teams cut cost-per-acquisition by 20-40% just by refining negative keywords and tightening campaign structure.
Ready to stop wasting money? Let’s talk about your account and find the biggest opportunities for improvement.