See foolish in American Heritage Dictionary 4 Synonyms
foolish silly fatuous absurd preposterous ridiculous ludicrous
These adjectives are applied to what is so devoid of wisdom or good sense as to be laughable: a foolish expenditure of energy; a silly argument; made fatuous remarks; an absurd idea that is bound to fail; a preposterous excuse that no one believed; offered a ridiculous explanation for his tardiness; a ludicrous criticism that was immediately dismissed.
See foolish in Webster's New World Roget's A-Z Thesaurus II
adjective
Displaying a complete lack of forethought and good sense:
brainless, fatuous, insensate, mindless, senseless, silly, unintelligent, weak-minded, witless. See ability, plannedSo senseless as to be laughable:
absurd, harebrained, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. (Informal) cockeyed, crazy, loony, loopy. (Slang) balmy2, dippy, dopey, jerky, sappy, wacky. See ability, knowledge
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