ANT: Manly, mature, vigorous, robust.
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KEY: Infatuation.
SYN: Fatuity, hallucination, madness, self-deception.
ANT: Clear-sightedness, sagacity, wisdom, sanity, soundness.
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KEY: Infeasible, [See FEASIBLE].
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KEY: Infect.
SYN: Taint, corrupt, contaminate, pollute, defile, [See CONTAMINATE].