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Acuity is sharpness or clearness of vision, hearing, or thought.

Acumen is the ability to make quick decisions and keen, precise judgments.

When you describe someone as astute, you think they quickly understand situations or behavior and use it to their advantage.

The adjective cerebral refers to the brain and/or its intellect.

Someone who is highly perceptive and intuitive is considered clairvoyant.

Cognitive describes those things related to judgment, memory, and other mental processes of knowing.

If you discern something, especially something that is not obvious, you notice, detect, or perceive it, especially after thinking about it carefully or studying it.

When people equivocate, they avoid making a clear statement; they are deliberately vague in order to avoid giving a direct answer to a question.

When you act in an imprudent fashion, you do something that is unwise, is lacking in good judgment, or has no forethought.

If an idea or thought is incisive, it is expressed in a penetrating and knowledgeable manner that is clear and brief; additionally, it can demonstrate impressive understanding of related ideas or thoughts.

The intelligentsia of a society are those individuals who are the most highly educated.

Someone who is irresolute is unable to decide what to do.

Jejune food is lacking in nutrition.

A person who is judicious shows good or sound judgment because they are wise and careful in making a decision.

Malaise is a feeling of discontent, general unease, or even illness in a person or group for which there does not seem to be a quick and easy solution because the cause of it is not clear.

Something that is mediocre is just average or adequate in quality.

A misapprehension is a misunderstanding or false impression that you are under, especially concerning another person’s intentions towards you.

A myopic person is unable to visualize the long-term negative consequences of their current actions; rather, they are narrowly focused upon short-term results.

If you are naive, you are too trusting of others; you either don’t have enough experience in life or you are childlike and simple.

If you describe something as nebulous, you mean that it is unclear, vague, and not clearly defined; a shape that is nebulous has no clear boundaries.

Someone is obtuse when they are slow to understand things; someone can choose to be obtuse when they deliberately do not try to figure things out.

Someone who is omniscient seems to know absolutely everything.

If you describe something as pedestrian, you think that it is ordinary and not interesting.

Someone who demonstrates perspicacity notices or understands things very quickly.

To be politic in a decision is to be socially wise and diplomatic.

If you handle something in a pragmatic way, you deal with it in a realistic and practical manner rather than just following unproven theories or ideas.

A precocious child shows advanced intelligence or skill at an unusually young age.

Someone who is prescient knows or is able to predict what will happen in the future.

When someone exhibits profundity, they display great intellectual depth and understanding; profundity can also be the depth or complexity of something.

If you are sapient, you are wise or very learned.

A savant is a person who knows a lot about a subject, either via a lifetime of learning or by considerable natural ability.

Stupor is a state in which someone’s mind and senses are dulled; consequently, they are unable to think clearly or act normally, usually due to the use of alcohol or drugs.

Something that stymies you presents an obstacle that prevents you from doing what you need or want to do.

A trite remark or idea is so overused that it is no longer interesting or novel.

Something that is turbid, such as water, is muddy or cloudy because it has lots of small pieces of matter or dirt in it.

To act in an uncouth manner is to be awkward and unmannerly.

Someone who is ungainly is clumsy or awkward; something ungainly can be difficult to use, primarily because of its size or weight.

Something that is vacuous is empty or blank, such as a mind or stare.

Venerable people command respect because they are old and wise.

A virtuoso is someone who is very skillful at something, especially playing a musical instrument.