The correct answer is Option (1) → indifferent
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Perfunctory (Adjective) means (of an action or gesture) carried out with a minimum of effort or reflection, merely as a duty. It suggests a lack of genuine interest or care.
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Indifferent (Adjective) means having no particular interest or sympathy; unconcerned. This captures the lack of genuine feeling implied by a perfunctory smile.
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Enthusiastic and Beaming suggest strong, positive emotions, making them antonyms.
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Hostile suggests strong negative emotion, which is different from the neutral, automatic quality of a perfunctory act.
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