From Longman Dictionary of Contemporary Englishgormlessgorm‧less /ˈɡɔːmləs $ ˈɡɔːrm-/ adjective British English informal STUPID/NOT INTELLIGENTvery stupid a gormless grin —gormlessly adverb
Examples from the Corpus
gormless• He just sat there with his mouth open looking really gormless.• a grinning, gormless boy• She was lolling in bed, her mouth wet and slack like a gormless child's.• There he was, that gormless face, crushed in amongst other gormless faces.• He was gormless, spoke in a funny nasal accent and looked as if he could do with a kick up the backside.• They might be big and slow but there was a sort of gormless unstoppability about them.• And at heart Big Bruv is an improvised soap, a slightly less gormless version of Neighbours.Origin gormless (1800-1900) gaumless “lacking understanding” ((18-20 centuries)), from gaum “understanding” ((18-19 centuries)), from Old Norse gaumr “heed, attention” 