The correct answer is Option (1) → ingenuous
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Astute (Adjective) means having or showing an ability to accurately assess situations or people and turn this to one's advantage; shrewd; clever.
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Ingenuous (Adjective) means innocent and unsuspecting; lacking sophistication or worldliness. This is the best antonym, as an astute person is highly sophisticated and shrewd, while an ingenuous person is the opposite.
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Avid means showing a keen interest or enthusiasm (unrelated).
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Infamous means well known for some bad quality or deed (unrelated).
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Morose means sullen and ill-tempered (unrelated).
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