madcap

Behaving or acting impulsively or rashly; wild.

A person who acts madly or wildly; a flighty or harebrained person; one who indulges in frolics.

Pertaining to or resembling a madcap; wild; harum-scarum.

A person of wild behavior; an excitable, rash, violent person.

Inclined to wild sports; delighting in rash, absurd, or dangerous amusements.

Wild; reckless.

impulsive, hasty or reckless; capricious.

An impulsive, hasty, capricious person.

An insane person, a lunatic.

characterized by undue haste and lack of thought or deliberation