ˈfachəwəs adjective
Etymology: Latin fatuus foolish, silly — more at bat
1.
a. : marked by want of intelligence and rational consideration ; especially : marked by futile ill-founded hope or desire, by witless complacent disregard of reality, or by inane lack of consideration
the fatuous adorer of that dilapidated, horrible woman — Arnold Bennett
men do argue about religion, and it is fatuous for those who argue on one side to try also to discredit all rational arguments — M.R.Cohen
: inanely foolish
aware that a fatuous expression was spreading like melted wax over his features — Ellen Glasgow
: absurd
one of the most fatuous plans for city improvement ever devised
: stupid , silly
a foolish woman given to fatuous remarks
b. chiefly Scots law : demented , imbecile
2. archaic : resembling an ignis fatuus : without reality : illusory
Synonyms: see simple