The correct antonym for "astute" is Option 3: ingenuous.
- Astute means shrewd, perceptive, or showing keen intelligence or insight.
- Ingenuous means innocent, naive, or unsuspecting, which is the opposite of being shrewd or perceptive.
Here are the meanings of the other options:
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Sharp: Having a keen edge or point; also used to describe someone who is quick to notice or understand things.
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Brilliant: Exceptionally intelligent, talented, or skillful; also used to describe something very bright or vivid.
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Prudent: Acting with or showing care and thought for the future; wise or judicious in practical affairs.
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