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vigilant - Watchful and quick to notice things, especially for protection or safety

The community stayed vigilant after recent reports of theft in the area

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concise - Containing only essential information and avoiding unnecessary detail.

His explanation was concise, covering all the key points without unnecessary elaboration.

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esoteric - Difficult to understand unless one has specific knowledge or interest.

The professor’s lecture on quantum theory was full of esoteric concepts.

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shrewd - Having or showing sharp powers of judgment; astute

Steve Jobs was a shrewd businessman who saw the digital revolution coming before most people did.

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clairvoyant - Having the supposed ability to perceive things beyond normal human senses, especially future events (psychic).

Her clairvoyant instincts helped her predict the outcome of the business deal.

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astute - Ability to understand things quickly and clearly, and to use the knowledge well

From a very early age, Gail instinctively knew everything about business, and and after college she proved to be an astute business woman, and became a millionaire before the age of 30.

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keen - Having a sharp or highly developed sense; or eager or enthusiastic about something.

She has a keen sense of smell and can detect even the faintest scents.