Ever watched a video of yourself and winced? It’s usually that one thing. You’re explaining a brilliant idea, but between every sentence, there’s a "uh" or a "um" or a "so, yeah." It’s brutal. We’ve all been told you can’t say um if you want to sound professional, but honestly, why is it so hard to stop?
The truth is, our brains move faster than our mouths. Or sometimes, it's the other way around. When you're searching for that perfect word, your brain panics. It wants to hold the floor. It hates silence. So, it fills the gap with a vocalized sigh.
Language experts call these "disfluencies." While they feel like a personal failure when you're standing at a podium or sitting in a high-stakes Zoom call, they're actually a deeply ingrained part of human linguistics. But here’s the kicker: while they are natural, they’re also incredibly distracting. If you’re trying to lead a team or nail an interview, your "ums" are essentially static on the radio. They make you sound like you’re guessing, even when you know your stuff cold.
The Science of Why We Fill the Silence
Why do we do it?
Psychologists like Herbert Clark have studied this for decades. Basically, an "um" or an "uh" serves as a signal to the listener. It says, "I'm still talking, don't interrupt me, I'm just processing." It’s a placeholder.
But there’s a nuanced difference between the two. Research suggests that "uh" is often used for short delays, while "um" signals a longer pause is coming. It’s almost like a loading bar for your speech. If you’re explaining something complex—say, the nuances of $CO_2$ sequestration or a messy legal contract—your brain needs a second to retrieve the specific vocabulary.
The problem is that in a professional setting, people interpret those loading bars as a lack of confidence.
Steven Pinker, the Harvard cognitive scientist, notes that while filler words are part of "natural" speech, "formal" speech is an entirely different beast. Formal speech requires a level of polish that feels unnatural to our biology. That’s why public speaking is a skill you have to build, not an instinct you’re born with.
Why You Can't Say Um in High-Stakes Moments
Think about the most influential speakers you know. Think about Steve Jobs or Barack Obama. They don’t "um." They pause.
There is immense power in a two-second silence.
Most people are terrified of silence. They think if they stop talking for a heartbeat, they’ve lost the audience. It’s the opposite. A pause creates tension. It gives the listener a chance to digest what you just said. When you replace an "um" with a pause, you move from sounding hesitant to sounding deliberate.
I remember a mentor once telling me that "um" is a "verbal tick of the insecure." That’s harsh. Maybe a little too harsh. But in the world of venture capital or executive leadership, perception is reality. If you’re pitching a five-million-dollar idea and you’re peppered with fillers, the person across the table wonders if you actually know the numbers or if you’re just making it up as you go.
The Psychological Toll of Over-Monitoring
Here’s where it gets tricky.
If you obsess too much over the fact that you can’t say um, you might actually get worse. It’s called "monitoring." When you focus more on how you are speaking than what you are saying, your cognitive load spikes. You start tripping over your words. You lose your train of thought.
It’s a paradox. To speak better, you have to care less about the perfection of the delivery and more about the clarity of the message.
Most speech coaches, like the late Dorothy Sarnoff, emphasized that breath is the key. When you run out of air, you tend to gasp or use a filler word as you inhale. If you learn to speak on a full tank of air and pause when you need to breathe, the "ums" naturally start to evaporate. It’s physical as much as it is mental.
Breaking the Habit Without Going Crazy
You won't fix this overnight. It’s like trying to change your gait or the way you hold a fork. It’s muscle memory.
The first step is actually hearing yourself. Most of us are "um-blind." We don't even know we're doing it. You have to develop an internal "ear."
- Record yourself. This is the worst part. Nobody likes the sound of their own voice. But you need to hear the frequency of your fillers. Are they at the start of sentences? In the middle?
- The "Pause and Breathe" Technique. When you feel that "um" coming up in your throat, just close your mouth. Breathe through your nose. It feels like an eternity to you, but to the listener, it just looks like you’re thinking deeply.
- Slow down. Fast talkers are the biggest offenders. If you’re racing to get to the end of your sentence, you’re going to hit a wall. Slowing your cadence by just 10% gives your brain the lead time it needs to find the next word without needing a filler.
- Vary your transitions. Instead of saying "so" or "like," use actual transitional phrases. Try "Moving on to..." or "The second point is..." or simply "Additionally."
Real-World Examples of the "Um" Trap
Consider the world of live news. Anchors are trained to avoid these at all costs. Why? Because a three-minute segment has no room for wasted airtime. If an anchor says "um" five times, they’ve lost fifteen seconds of actual news.
Or look at the tech world. In 2026, with the rise of AI-driven voice assistants and automated transcription, filler words are becoming even more obvious. When you see a transcript of a meeting and it’s littered with [um] and [uh], the "signal-to-noise ratio" is terrible. It makes the document harder to read and the speaker look less competent on paper.
There’s also a gendered and cultural component here. Some studies suggest that women are often more heavily criticized for using filler words like "like" or "just," while men get a pass for "uh." It’s unfair, but it’s a reality of the modern workplace. Mastering your speech isn't just about sounding "smart"—it’s about removing any excuse for someone to dismiss your ideas.
Is "Um" Ever Okay?
Believe it or not, yes.
In very casual settings, being too polished makes you look like a robot. If you’re at a bar with friends and you speak in perfectly formed, filler-free sentences, people are going to think you’re weird. Or that you’re practicing a cult initiation speech.
In those contexts, "um" and "uh" act as social lubricants. They make you seem approachable and human. They show that you’re thinking in real-time with the other person, rather than reciting a script.
The goal isn't to reach 0% fillers. The goal is to eliminate them when they undermine your authority. If you’re giving a wedding toast, a few "ums" are charming. If you’re testifying in court or asking for a raise, they’re a liability.
Actionable Steps to Clearer Speech
If you're serious about the idea that you can’t say um in your professional life, start small. Don't try to fix every conversation at once.
- The Low-Stakes Practice: Pick one meeting a day. Just one. Decide that for those 30 minutes, you will focus on pausing instead of filling. Don't worry about the other meetings. Just win that one.
- Eye Contact Maintenance: Interestingly, we tend to "um" more when we look away from our listener. When we look away, we’re signaling that we’re searching our internal "files." By maintaining eye contact (without being creepy), you're more likely to keep your speech linear.
- The "And" Diet: "And" is the hidden filler word. People string together five sentences with "and... and... and..." Stop. Use a period. Let the sentence end.
- Identify Your Triggers: Do you "um" more when you're nervous? When you're explaining technical data? When you're interrupted? Once you know your triggers, you can prepare "buffer phrases" to use instead of fillers. For example, if you’re asked a tough question, instead of "Um, let me think," try "That’s a great question, let's look at the data."
Speech is a physical act. It requires coordination between your lungs, your vocal cords, your tongue, and your brain. Like any physical act—be it a golf swing or typing—it can be refined with deliberate practice.
The next time you’re about to speak, remember: the silence is your friend. It’s not a hole you need to fill. It’s a space you own. When you stop fearing the quiet, you stop needing the "um."
Start by recording your next phone call. Listen to the first two minutes. Count the fillers. That number is your baseline. Your only job for the next week is to get that number down by two. That’s it. Small, incremental shifts in how you handle silence will do more for your professional "presence" than any power suit or fancy slide deck ever could.
