FAT'UOUS, adjective [Latin fatuus.]
1. Feeble in mind; weak; silly; stupid; foolish.
2. Impotent; without force or fire; illusory; alluding to the ignis fatuus.
Thence fatuous fires and meteors take their birth.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.