- /fooh"lish/, adj.1. resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.2. lacking forethought or caution.3. trifling, insignificant, or paltry.[1250-1300; ME folish, foolish. See FOOL1, -ISH1]Syn. 1, 2. senseless, vacant, vapid, simple, witless. FOOLISH, FATUOUS, SILLY, INANE, STUPID, ASININE imply weakness of intellect and lack of judgment. FOOLISH implies lack of common sense or good judgment or, sometimes, weakness of mind: a foolish decision; The child seems foolish. FATUOUS implies being not only foolish, dull, and vacant in mind, but complacent and highly self-satisfied as well: fatuous and self-important; fatuous answers. SILLY denotes extreme and conspicuous foolishness; it may also refer to pointlessness of jokes, remarks, etc.: silly and senseless behavior; a perfectly silly statement. INANE applies to silliness that is notably lacking in content, sense, or point: inane questions that leave one no reply.STUPID implies natural slowness or dullness of intellect, or, sometimes, a benumbed or dazed state of mind; it is also used to mean foolish or silly: well-meaning but stupid; rendered stupid by a blow; It is stupid to do such a thing. ASININE originally meant like an ass; it applies to witlessly stupid conversation or conduct and suggests a lack of social grace or perception: He failed to notice the reaction to his asinine remarks. 1. imprudent, unreasonable, foolhardy, irrational; thoughtless, nonsensical, ridiculous, absurd, pointless, preposterous.
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