1. the trait of lacking restraint or control; reckless freedom from inhibition or worry - she danced with abandon • Syn: abandon, unconstraint • Derivationally related forms: wanton • Hypernyms: unrestraint 2. the quality of being lewd and lascivious • Syn: licentiousness • Derivationally related forms: wanton, licentious (for: licentiousness) • Hypernyms: immorality