brainless

adjective

Stupid; very foolish.

SYNONYMS

as thick as two short planksbirdbrainedbrain-deadchowderheadedcretinousdippydivvydofdopeydotishdozydumbdunderheadedempty-headedfoolishglaikithalf-bakedhalf-wittedidioticignorantimbecileimbeciliclamebrainedmindlessmoronicpea-brainedpinheadedsillysimple-mindedstupidthickthickheadedunintelligentwitlesswooden-headed