madcapEnglishOxford New American Dictionarymadcap /ˈmadˌkap, ˈmædˌkæp / ▸ adjective amusingly eccentric: a surreal, madcap novel. ▪ done or thought up without considering the consequences; crazy or reckless: some madcap money-making scheme. ▸ noun an eccentric person.