How to Use Negative Keywords to Stop Wasting Ad Spend

Negative keywords prevent your ads from showing for irrelevant searches, directly reducing wasted ad spend. Accounts without active negative keyword management typically waste 15-30% of their budget on clicks that will never convert. This guide covers the complete workflow from finding negatives to maintaining them over time.

Key Takeaways

• Review the search terms report weekly for new irrelevant queries — they appear constantly
• Negative match types work differently from standard match types — broad match negatives do not include close variants
• Organize negatives into shared lists by theme for efficient management across campaigns
• Start with a pre-built industry list on day one, then refine based on your actual data
• Audit negatives quarterly to ensure you are not blocking queries that have become relevant

Introduction

Every Google Ads account receives clicks from irrelevant searches. Broad match and phrase match keywords cast a wide net, and Google’s AI-driven intent matching sometimes gets it wrong. Without negative keywords, you pay for every one of these irrelevant clicks.

The search terms report reveals the actual queries that triggered your ads. Reviewing it regularly and adding negatives is one of the highest-ROI maintenance activities in Google Ads — yet many accounts go months without a single negative keyword addition.

The cost of neglecting negatives compounds over time. Each irrelevant click wastes budget that could have gone to a relevant search. At scale, this represents thousands of dollars in monthly waste.

Step 1: Mine the Search Terms Report for Irrelevant Queries

The search terms report is your primary source for identifying negative keyword candidates.

How to access it:

1. In Google Ads, navigate to Insights and reports > Search terms
2. Set the date range to the last 30 days (or 14 days for high-volume accounts)
3. Sort by Cost descending — this surfaces the most expensive irrelevant queries first

What to look for:

Prioritization: Focus first on queries that have high spend and zero conversions. A query that cost $50 with no conversions is a clear negative candidate. A query that cost $50 with 2 conversions might be worth keeping, even if it looks tangentially relevant.

Beyond the search terms report:

Google only shows search terms that meet a minimum impression threshold. To catch patterns the report misses:

• Use Google Search Console to see organic queries — if irrelevant terms appear organically, they likely appear in paid search too
• Brainstorm industry-specific irrelevant terms (competitor brands, unrelated product categories, common modifiers like “free,” “cheap,” “DIY”)
• Check Google Trends for trending queries that might trigger your keywords

Step 2: Choose the Right Negative Match Type

Negative match types behave differently from standard keyword match types. Understanding the differences is critical to avoid over-blocking.

Negative match type comparison:

Critical difference from standard match types: Negative broad match does NOT include close variants. If you add “running shoes” as a negative broad match, it will NOT block “running shoe” (singular). You must add variations manually.

When to use each type:

• Negative broad match: When you want to block an entire topic. Adding free as a negative broad blocks any query containing the word “free.”
• Negative phrase match: When the combination matters but individual words are fine. Adding "shoe repair" as a negative phrase blocks “shoe repair near me” but not “repair my running shoes.”
• Negative exact match: When you want to block one specific query while keeping similar queries active. Use sparingly — it is very precise.

Common mistake: Using negative exact match when negative broad or phrase would be more efficient. If you add [free running shoes] as negative exact match, you still pay for “free running shoe,” “free shoes for running,” and dozens of variations. Use negative broad match free instead.

Step 3: Organize Negatives into Shared Lists

As your negative keyword collection grows, organization becomes critical. Shared negative keyword lists let you maintain negatives centrally and apply them across multiple campaigns.

Recommended list structure:

How to create shared lists:

1. Navigate to Tools > Shared library > Negative keyword lists
2. Click ”+” to create a new list
3. Name it following your convention
4. Add negative keywords with correct match types
5. Apply the list to relevant campaigns

Cross-campaign negatives deserve special attention. If you have separate campaigns for “running shoes” and “hiking boots,” each should negative out the other’s terms to prevent overlap and self-competition.

Manually maintaining negative keyword lists across a large account or across multiple client accounts is one of the most time-consuming tasks in Google Ads management. Lyra’s Intelligent Negative Keywords Manager automates search term analysis, suggests negatives based on performance patterns, and manages shared lists across all campaigns and accounts from a single interface.

Step 4: Build a Proactive Negative Keyword Strategy

Reactive negative keyword management (finding waste after it happens) is necessary but insufficient. A proactive strategy prevents waste before it occurs.

Day-one negative lists:

Before launching any campaign, add negatives for predictable irrelevant queries:

Industry-specific lists:

Every industry has its own set of irrelevant modifier terms. A B2B SaaS company should negative out consumer-oriented terms. A luxury brand should negative out discount-seeking terms. Build these lists based on experience and refine them with data.

Automated rules:

Set up automated rules to flag high-spend, zero-conversion search terms:

1. Navigate to Tools > Rules
2. Create a rule that alerts you when a search term spends more than your target CPA with zero conversions
3. Review these flagged terms weekly and add as negatives

Step 5: Maintain and Audit Negative Lists Regularly

Negative keyword lists are not static. They require ongoing maintenance to stay effective and to avoid over-blocking.

Weekly maintenance (15-30 minutes):

1. Review search terms report for the past 7 days
2. Sort by spend descending
3. Add new irrelevant terms as negatives
4. Check for new patterns (seasonal terms, trending topics, new competitors)

Quarterly audit (1-2 hours):

1. Review negative lists for over-blocking — Export all negative keywords and review for terms that might now be relevant. Market shifts, product line changes, and strategy pivots can make previously irrelevant terms valuable.

2. Check impression share — If impression share is declining and you have been adding negatives aggressively, you may be over-blocking. Compare impression share trends against your negative keyword additions timeline.

3. Cross-reference with conversion data — Look for negative keywords that match converting search terms in other campaigns. If “tutorial” is a negative in your sales campaign but “product tutorial” converts in your content campaign, the negative is correctly scoped. If not, adjust.

4. Consolidate and clean — Remove duplicate negatives, merge overlapping lists, and verify that match types are appropriate.

Scaling the process:

For accounts with 50+ campaigns, manual weekly reviews become impractical. The search terms report grows exponentially with campaign count, and maintaining cross-campaign negatives manually invites errors.

Lyra’s Intelligent Negative Keywords Manager processes search terms across all campaigns continuously, identifying negative keyword candidates based on spend-to-conversion ratios, cross-referencing against converting terms to prevent over-blocking, and flagging conflicts between campaign-level and list-level negatives.

Practical Example

An online furniture retailer running broad match campaigns discovers significant waste in their search terms report:

Initial search terms analysis (30-day window):

Result of negative keyword additions:

The account maintained the same conversion volume while cutting $1,680/month in waste — a 20% efficiency gain from negative keyword management alone.

Common Mistakes

• Only reviewing search terms monthly — New irrelevant queries appear daily, especially with broad match. Weekly reviews catch waste before it accumulates.
• Using only negative exact match — Blocking one specific query leaves hundreds of variations unblocked. Use negative broad or phrase match to cover patterns efficiently.
• Not adding close variants — Negative broad match does not include close variants. If you block “running shoes,” you must separately block “running shoe,” “running sneakers,” and other variations.
• Applying negatives too broadly — Adding a negative at the account level when it should be campaign-specific can block relevant traffic. “Free” is a good negative for a retail campaign but would block “free trial” queries for a SaaS company’s trial campaign.
• Never auditing existing negatives — Business changes, product launches, and market shifts can make old negatives counterproductive. Quarterly reviews prevent over-blocking.

Lyra’s Intelligent Negative Keywords Manager handles the entire negative keyword lifecycle — from discovery through organization, application, and ongoing audit — across all your connected accounts, ensuring waste is caught early without over-blocking valuable traffic.