Why the Most Intelligent People Often Feel the Least Confident

The less people know, the more certain they feel about their opinions. In 1999, researchers found that those in the bottom 25% of test scores consistently rated themselves as being in the top 60%. They don’t know enough to realize how much they are missing, which creates an iron-clad shield of “unearned confidence.” This is actually a big problem. Here’s why…

Let’s say you’re hiring a builder for a job that’s costing your life’s savings. Do you gamble on someone who sounds like they know what they’re talking about? What if their confidence is actually hiding their incompetence? So what’s the answer?

Don’t trust confidence. After all, anyone can fake confidence to get what they want. And many people will learn tricks to persuade people. Ask a person to “explain the mechanics” of their plan rather than debating the conclusion.

Source: Kruger J and Dunning D, “Unskilled and Unaware of It: How Difficulties in Recognizing One’s Own Incompetence Lead to Inflated Self-Assessments,” 1999.

Genuine experts know what they don’t know. They understand edge cases and unknown variables. If someone doesn’t recognize the blind spots upfront, that’s a red flag, because they won’t plan for them and they’ll miss them when they do the work, which will end up costing you more money.

Action: Don’t automatically trust confident people: be careful, especially if you’re spending a lot of money.

Aggressive confidence is often a social mask for deep-seated incompetence. Research shows that people who feel threatened by their own lack of skill often lean into “dominance behaviors” to maintain status. Their loud voice is a survival mechanism, not a sign of intelligence.

Action: If sonmeone regularly exhibits these characteristics, walk away before they cause a distaster becausre they haven’t planned properly.
Source: Cheng JT, et al, “Pride, Personality, and the Evolutionary Foundations of Human Social Status,” 2010.

Protect your projects by building “Incompetence Insurance” into your systems. You cannot change a Dunning-Kruger victim, but you can limit their blast radius. Use objective data, checklists, and third-party audits to ensure that “loud opinions” never override “hard facts.”

Action: Require written data or a second opinion for any high-stakes decision involving a “loud” peer.
Source: Kahneman D, “Thinking, Fast and Slow,” 2011.

Overconfidence teaches risk-taking Less knowledgeable individuals often appear decisive and assertive. Confidence is mistaken for competence. But that can lead to uncalculated risks.

Action: Evaluate track record, not delivery style: be very careful about trusting the professional opinion of a confident person and keep this in mind during important interactions.
Source: Overconfidence bias is well-documented in behavioral economics (Kahneman & Tversky).

But what if it’s the other way around? How do you become more confident if you’re intelligent but full of doubt? To prevent your intelligence from sabotaging your confidence try to compare yourself to your past self and to low performers—not only to top performers.
Source: Social comparison theory (Festinger, 1954) explains confidence shifts relative to comparison group.

Intelligence teaches second-order thinking, which teaches caution. Smarter individuals consider downstream consequences and unknowns. More variables = less certainty.

Action: Recognize that caution can be a sign of depth, not weakness: allow this understanding to give you confidence but use it with humility.
Source: Research links higher cognitive ability to greater probabilistic reasoning (Stanovich & West).

Awareness of bias teaches restraint, which enables better decisions. Intelligent people often understand cognitive bias. That awareness tempers confidence.

Action: Treat doubt as calibration—not failure.
Source: Metacognitive awareness correlates with reduced overconfidence bias.

Intellectual humility teaches growth, which leads to long-term mastery. Recognizing limits keeps learning alive. Arrogance stops growth.

Action: Replace “I know” with “I’m still learning”.
Source: Research on intellectual humility links it to improved learning outcomes (Krumrei-Mancuso et al, 2020).

The Real Lesson. If you sometimes feel less confident as you grow more knowledgeable, that’s not weakness, it’s awareness. The loudest voice in the room is rarely the most informed.

Be careful when you interact with a confident person: they could do more harm them good. Disarm them with calm, polite but probing questions to determine their level of understanding — your project could depend on it.