unintelligent

Calling someone "unintelligent" is not kind, but it means they seem slow to understand things or poor at making sound choices. It usually suggests more than one small mistake. In a story, a character who keeps walking into obvious traps might be described this way. The word can also describe actions, not just people; an unintelligent decision is one made without enough thought about what might happen next. Still, people learn in different ways and have different strengths, so this label can be unfair as well as hurtful.

"Unintelligent" describes someone or something that seems to show weak understanding, poor reasoning, or limited good sense. It is a strong word, and it usually suggests more than a single careless moment or one simple mistake. While "stupid" is often used in similar situations, "unintelligent" sounds a little more formal and usually less blunt, though it can still sound harsh.

Context matters a lot when using this word. It is often better to describe a person's specific behavior than to label the whole person. For example, instead of saying "He is an unintelligent driver," you might say, "His driving was careless and showed poor judgment." That sounds more exact and less needlessly insulting.

People also use the word for decisions, plans, or actions. For example, "It would be unintelligent to spend all your money on one risky idea" means the choice would show poor judgment. In this kind of use, the word points to the action itself rather than attacking a person's whole character.

Related words include foolish, unwise, dense, and slow-witted. The opposite is intelligent. Even so, this is a sensitive word, because it judges someone's mental ability or judgment, and that can be unfair, especially when you do not know the full situation.