← BackshareGuesslamebrained/ˈleɪmˌbreɪnd/adjectiveStupid or foolish; showing a lack of intelligence.That was a lamebrained idea to paint the floor before moving the furniture.I can't believe she fell for such a lamebrained scam.His lamebrained plan to cross the river on a log ended in disaster.SynonymsfoolishidioticsenselessAntonymssmart