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fatuitous

[fuh-too-i-tuh s, -tyoo-]
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adjective
  1. complacently stupid; foolish.

Origin of fatuitous

First recorded in 1725–35; fatuit(y) + -ous
Related formsfa·tu·i·tous·ness, nounun·fa·tu·i·tous, adjectiveun·fa·tu·i·tous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018