madcapEnglishOxford Dictionary of Englishmadcap /ˈmadkap / ▸ adjective amusingly eccentric: a surreal, madcap novel. ▪ done without considering the consequences; foolish or reckless: a madcap scheme. ▸ noun an eccentric or reckless person. – ORIGIN late 16th century (in the sense ‘mad person’): from mad + cap1.