adj. 25B6; adjective FOOLISH, stupid, unintelligent, idiotic, brainless, mindless; fatuous, inane, half-baked, empty-headed, slow-witted; informal thick, birdbrained, pea-brained, dopey, dim, dim-witted, half-witted, dippy, lamebrained, wooden-headed; Brit. informal daft; Scottish & N. English informal glaikit.
WITLESS
Meaning of WITLESS in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012