The difference between Fatuous and Imbecilic
When used as adjectives, fatuous means obnoxiously stupid, vacantly silly, content in one's foolishness, whereas imbecilic means like or as an imbecile.
check bellow for the other definitions of Fatuous and Imbecilic
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Fatuous as an adjective:
Obnoxiously stupid, vacantly silly, content in one's foolishness.
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Imbecilic as an adjective:
like or as an imbecile; so senseless as to be laughable; absurd, foolish, stupid, idiotic.