Fat″u‐ous (?), a. [L. fatuus.] 1. Feeble in mind; weak; silly; stupid; foolish; fatuitous. Glanvill.
2. Without reality; illusory, like the ignis fatuus.
Thence fatuous fires and meteors take their birth. Danham.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.