Synonyms for madcap Found 10 synonyms across 2 meanings for “madcap”. a reckless impetuous irresponsible person (noun) daredevilhotheadswashbucklerlunaticharum-scarum characterized by undue haste and lack of thought or deliberation (adj) hotheadedimpulsiveimpetuoustearaway(a)brainish Explore Related Words Rhymes with madcapSynonyms for daredevilSynonyms for hotheadSynonyms for swashbucklerSynonyms for lunaticSynonyms for harum-scarum Synonym Finder | Rhyme Finder | Poetry Editor