D defs.my
Entry 2 senses Webster, 1913

Fatuous

/făch'-əw-əs/ · Fat·u·ous · IPA /ˈfæ.tʃu.əs/
01 a. Feeble in mind; weak; silly; stupid; foolish; fatuitous.
  1. 1.
    Feeble in mind; weak; silly; stupid; foolish; fatuitous.
  2. 2.
    Without reality; illusory, like the ignis fatuus.
    “Thence fatuous fires and meteors take their birth.” — Danham.