A doctrine or practice characterized by fatuous or foolish behavior; the tendency to act without wisdom or good judgment.
From Latin 'fatuus' (foolish) plus the ideology-forming suffix '-ism', creating a noun for beliefs or practices centered on fatuous conduct.
The '-ism' suffix typically names philosophies and belief systems, so 'fatuism' humorously suggests foolishness elevated to the level of ideology—a hilarious way to describe willful stupidity.
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