7 phrases you should always avoid if you want to sound intelligent, according to psychology

You know that sinking feeling when you realize you’ve been using a phrase that makes you sound less intelligent than you actually are?

I had one of those moments a few years back during a pitch meeting for my startup. I was presenting to potential investors, and I kept saying “I think” before every point I made. “I think our user acquisition strategy will work.” “I think we can hit those revenue targets.” By the end, one investor pulled me aside and said, “Stop thinking and start knowing. Your uncertainty is showing.”

That feedback stung, but it was a wake-up call. The words we use shape how others perceive our intelligence and competence. And here’s the kicker: psychology backs this up. Certain phrases, no matter how harmless they seem, can instantly undermine your credibility and make you sound less intelligent.

Today, let’s dive into seven phrases you should avoid if you want to sound sharp and confident. Some of these might surprise you.

1. “I think” or “I feel like”

Remember that investor feedback I mentioned? It turns out they were onto something.

When you constantly preface your statements with “I think” or “I feel like,” you’re essentially telling people you’re not confident in what you’re saying. You’re hedging your bets, creating an escape route in case someone challenges you.

There’s a massive difference between “I think we should pivot our strategy” and “We should pivot our strategy.” The second version sounds decisive. It sounds like you’ve done your homework and you’re ready to stand behind your words.

Does this mean you should never express uncertainty? Of course not. Sometimes you genuinely don’t know something, and that’s fine. But when you do know something, own it. State it clearly. Let your words reflect the confidence you have in your ideas.

2. “Like” and “you know” as filler words

We all have that friend who peppers their sentences with “like” every three words. “So like, I was at the store, and like, this guy comes up to me, and he’s like…”

Research indicates that overusing filler words like ‘like’ and ‘you know’ can reduce credibility. These verbal crutches fill the silence while your brain catches up with your mouth, but they dilute your message and make you sound unsure.

I used to be terrible with this. Recording myself during practice presentations was painful—I counted 47 “likes” in a five-minute pitch. Once I became aware of it, I started pausing instead of filling the space with meaningless words. A brief pause actually makes you sound more thoughtful and deliberate.

Try this: next time you’re about to say “like” or “you know,” just pause. Take a breath. Then continue. It feels awkward at first, but it makes a world of difference in how intelligent and composed you sound.

3. “I’m fine” when you’re clearly not

This one’s tricky because it’s so automatic. Someone asks how you are, and you reflexively say “I’m fine” even when you’re falling apart inside.

Using “I’m fine” when you’re not makes you seem emotionally unaware or unwilling to engage authentically. Smart people understand that acknowledging reality, even when it’s uncomfortable, is a sign of emotional intelligence.

You don’t have to spill your guts to everyone who asks. But consider more honest alternatives: “It’s been a challenging day, but I’m working through it” or “Not my best day, but thanks for asking.” These responses show self-awareness without oversharing.

4. “I don’t care”

Ever been in a meeting where someone asks for your opinion and you respond with “I don’t care”? You might think you’re being easygoing, but you’re actually shooting yourself in the foot.

This phrase signals disengagement and apathy. It tells people you can’t be bothered to form an opinion or contribute meaningfully to the discussion. Even if you genuinely don’t have a strong preference, there are smarter ways to express flexibility.

Instead of “I don’t care,” try “I’m flexible on this” or “Both options work for me.” These alternatives show you’re engaged and collaborative without being pushy. They demonstrate that you’ve considered the options even if you don’t have a strong preference.

5. Unnecessarily complex language

Here’s something counterintuitive: using big words doesn’t make you sound smarter.

I learned this the hard way when I first started writing. I’d pull out the thesaurus and replace simple words with complex ones, thinking it made me sound more sophisticated. Turns out, I just sounded like I was trying too hard.

Psychology research backs this up; using unnecessarily complex language when simpler words can actually makes you seem less intelligent. People appreciate clarity. They respect someone who can explain complex ideas in simple terms.

Think about the smartest people you know. Do they speak in jargon-filled sentences that require a dictionary to decode? Probably not. They communicate clearly and effectively. They make complex ideas accessible.

6. “You always” or “you never”

These absolute statements are relationship killers and intelligence reducers rolled into one.

When you say “You always interrupt me” or “You never listen,” you’re making sweeping generalizations that are rarely accurate. More importantly, you’re demonstrating black-and-white thinking that lacks nuance and intelligence.

Smart people understand that behavior exists on a spectrum. They recognize patterns without resorting to absolutes. Instead of “You never help with the dishes,” try “I’ve noticed the dishes have been piling up lately. Can we figure out a better system?”

This shift shows you can think critically, identify specific issues, and work toward solutions rather than just throwing accusations around.

7. “Whatever you want”

Finally, we have the passive-aggressive champion of phrases that make you sound less intelligent.

When you say “whatever you want” in a dismissive tone, you’re not being accommodating—you’re checking out of the conversation. You’re essentially saying you can’t be bothered to engage meaningfully or that you’re above the discussion.

I’ve seen this phrase tank professional relationships. A colleague once responded to every suggestion with “whatever you want,” thinking he was being agreeable. Instead, he came across as disinterested and resentful. His boss eventually stopped asking for his input altogether.

If you genuinely want to be flexible, say so constructively: “I trust your judgment on this” or “You have more expertise here, so I’ll follow your lead.” These phrases show deference without disengagement.

The bottom line

Words matter more than we realize. The phrases we use shape not only how others perceive us but also how we perceive ourselves.

I’ve mentioned this before, but changing ingrained speech patterns isn’t easy. It takes conscious effort and practice. Start by picking one or two phrases from this list that you know you overuse. Focus on eliminating those first before moving on to others.

Record yourself in conversations or presentations if you can. The awareness alone will start shifting your language patterns. And remember, the goal isn’t to sound like a robot or to overthink every word. It’s about being intentional with your language and ensuring your words reflect the intelligence and capability you possess.

The smartest people I know aren’t the ones who use the biggest words or the most complex sentences. They’re the ones who communicate clearly, think critically, and choose their words carefully. That’s the kind of intelligence worth cultivating.