Home › Words › M › madcapperymadcapperymadcappery means the action or behavior of a madcap.EtymologyFrom madcap + -ery.nounThe action or behavior of a madcap.e.g.“I thought of Scott dangling from that flagpole at the top of Fifty Penn Place, and no wonder he seemed unimpressed by my own madcappery.” — 2014, Blake Bailey, The Splendid Things We Planned: A Family Portrait:Definitions & examples from Wiktionary (CC BY-SA 3.0).