Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How a Single Word in a Headline Changed Everything
Transcript
- Lucas: There's a classic ad for a car wax from the 1970s, and the headline reads: 'You could drive a nail through a board with this wax.' Luna: Wait — you're saying the wax was so hard you could hammer a nail with it? Lucas: That's exactly the impression. But notice the word 'could.' It's not 'you can.' It's not 'this wax will let you.' It's 'could.' That tiny qualifier is a weasel word — and it's brilliant. Luna: So the advertiser is making a huge claim but technically not promising anything. Lucas: Right. The copywriter, Carl Johnson, knew that if he said 'you can,' the reader would demand proof. But 'could' is speculative. It invites the reader to imagine it, without the brand having to prove it in court. And the image of a nail going through a board is so vivid that the reader's brain fills in the rest. Luna: But isn't that deceptive? I mean, using weasel words feels a bit slimy. Lucas: It can be. But the interesting thing is that weasel words actually increase believability in many contexts. A study from the Journal of Advertising Research found that hedged claims — 'helps reduce wrinkles' vs. 'reduces wrinkles' — were rated as more credible by consumers. The absolute claim triggers skepticism. The hedged claim sounds more honest. Luna: So sometimes being less assertive makes you more persuasive. Lucas: Exactly. And the best copywriters know that the brain is a pattern-matching machine. When you say 'virtually spotless,' the brain hears 'spotless' and forgets the 'virtually.' But if you said 'spotless' outright, the brain would start looking for flaws. Luna: What are the most common weasel words in headline copy today? Lucas: The classics are 'helps,' 'virtually,' 'can,' 'might,' 'up to,' 'as much as,' 'often,' 'usually,' 'almost,' 'practically.' You see them everywhere. 'Helps you lose weight.' 'Can improve memory.' 'Up to 50 percent off.' That 'up to' is critical — it covers the store if only one item is actually half price. Luna: But don't consumers get wise to this? I feel like I've become numb to 'up to' offers. Lucas: Some do. But the research shows that even when people consciously notice the weasel word, the emotional impact of the claim still registers. The word 'could' in that car wax ad — the image of driving a nail — that sticks. The qualifier is like a disclaimer that the conscious mind accepts, but the unconscious mind still runs with the picture. Luna: So you're saying we should use weasel words more, not less? Lucas: I'm saying use them deliberately. The worst copy is the kind that makes absolute claims that the reader knows can't be true. 'The best car wax in the world' — that's puffery, and most people ignore it. But 'you could drive a nail through a board' — that's specific, visual, and the weasel word makes it legally safe and psychologically intriguing. Luna: Give me another example where a weasel word saved a campaign. Lucas: There's a famous case from the 1980s: a toothpaste brand wanted to claim that its formula 'whitens teeth.' But the clinical trials only showed a modest effect. The copywriter changed the headline to 'Helps whiten teeth.' That single word 'helps' allowed them to run the ad without FDA scrutiny, and sales went up 15 percent in the test market. Luna: So 'helps' is like a legal shield that also persuades. Lucas: Exactly. And it's not just about avoiding lawsuits. It's about managing expectations. When you say 'helps,' you're inviting the reader to co-create the benefit. The reader thinks, 'Okay, this product assists, but I also have to do my part.' That can actually increase satisfaction because the reader feels more involved. Luna: That reminds me of Patagonia's 'Don't Buy This Jacket' campaign — they told people not to buy their product unless they really needed it. Lucas: Perfect example. Patagonia uses reverse psychology and brutal honesty. They under-promise. Their copy often says things like 'This jacket will keep you warm in most conditions' — note the 'most.' That's a weasel word. But because the brand is so transparent, the reader trusts the claim more than if they said 'all conditions.' Luna: So weasel words can build trust if they're used honestly. Lucas: Right. The key is that the qualifier must be truthful. If you say 'virtually spotless' and the product leaves streaks, the weasel word becomes a lie. But if it genuinely leaves dishes almost spotless, then 'virtually' is accurate and the customer feels the brand is being modest. Luna: I want to test this. Write me a headline for a productivity app without a weasel word, and then with one. Lucas: Sure. Without: 'This App Doubles Your Productivity.' That's a bold claim. Many people will roll their eyes. With a weasel word: 'This App Can Help You Get More Done in Less Time.' The word 'can' and the phrase 'help you' soften it. The second headline is actually more believable, and I'd bet it converts better. Luna: But what about when you want to be authoritative? Like a headline for a financial advisor. Lucas: That's a great question. In high-stakes contexts like finance or health, weasel words can backfire. If a financial advisor says 'We might help you retire comfortably,' that sounds weak. In those cases, you want a mix: a strong core claim with a subtle qualifier. For example: 'Our Clients Typically Retire With 20% More Income.' The word 'typically' is a weasel word, but it's paired with a specific number. That feels authoritative but not overpromising. Luna: So it's about calibrating the level of certainty to the context. Lucas: Exactly. And the best copywriters test this. They run A/B tests with and without weasel words. Often the version with the weasel word wins because it reduces skepticism. But sometimes, especially with a very strong unique selling proposition, the absolute version wins because the claim is so obviously true that any qualifier would weaken it. Luna: What if the claim is genuinely provable? Like 'This car wax has been tested to withstand 500 pounds of pressure.' Lucas: Then you don't need a weasel word. Use the proof. 'Tested to withstand 500 pounds' is stronger than 'can withstand.' But notice that even that claim has an implicit qualifier — 'tested to' means under specific conditions. But it sounds absolute enough. Luna: So weasel words are a tool, not a crutch. Use them when the claim needs protection, but drop them when you have hard evidence. Lucas: Perfect summary. And here's a final tip: read your headline out loud. If it sounds like a used car salesman, you've gone too far. If it sounds like a cautious friend giving advice, you're probably in the right zone. Luna: If these marketing deep dives have sparked something you've actually used in your own writing or campaigns — that's exactly why we make them. A couple of dollars a month is genuinely what keeps these going. Buy me a coffee dot com slash fexingo, if you've gotten something out of them. Lucas: Yeah, it really does make a difference. Even small contributions add up and let us keep the show ad-free and focused on the craft. Luna: Alright, back to weasel words. One more thing: I've noticed that in email subject lines, the word 're:' is used as a weasel word — implying a previous conversation that didn't happen. Lucas: That's a classic trick. 'Re: your request' or 'Re: our conversation.' It's deceptive and usually gets a high open rate but also high complaint rates. I'd avoid it unless you actually have a prior relationship. The weasel word works best when it's honest. If you use it deceptively, you burn trust. Luna: So the lesson is: use weasel words to protect yourself and increase believability, but never to deceive. Lucas: Exactly. And always test. What works for one audience may not work for another. The best weasel word is the one that survives the A/B test. Luna: Alright, I'm going to go back through my headlines and see where I can add a 'could' or a 'helps'. Lucas: Just don't overdo it. One weasel word per headline is plenty. Two and you start sounding evasive. Luna: Good advice. Thanks, Lucas. Lucas: Thanks, Luna. That's it for today. Next time we'll look at the power of specific numbers in headlines — and why '37 percent' beats 'nearly 40 percent' every time.