Synonyms for loony Found 26 synonyms across 2 meanings for “loony”. someone deranged and possibly dangerous (noun) crazylooneynutcaseweirdo informal or slang terms for mentally irregular (adj) balmybarmybatsbattybonkersbuggycrackedcrackersdaftdottyfruityhaywirekookykookieloco Explore Related Words Rhymes with loonySynonyms for crazySynonyms for looneySynonyms for nutcaseSynonyms for weirdoSynonyms for balmy Synonym Finder | Rhyme Finder | Poetry Editor