Madcap

Adjective

 * 1) impulsive, hasty or reckless; capricious.
 * The film featured a madcap car chase that went right through a crowded café.

Thesaurus
Mafioso, Young Turk, adventurer, adventuress, adventurous, ardent, audacious, banana, beast, beldam, berserk, berserker, bold, bomber, brash, brazenface, brute, burlesquer, caricaturist, clown, comedian, comic, cutup, daredevil, daring, death-defying, demon, devil, dragon, epigrammatist, fanatic, fiend, fiery, fire-eater, fire-eating, firebrand, flaming, foolhardy, forward, funnyman, fury, gag writer, gagman, gagster, goon, gorilla, gunsel, hard-core, hardnose, harebrained, harum-scarum, hasty, heated, hell-raiser, hellcat, hellhound, hellion, holy terror, hood, hoodlum, hot, hothead, hotheaded, hotspur, humorist, incendiary, inflamed, ironist, jester, joker, jokesmith, jokester, killer, lampooner, mad dog, madbrain, madbrained, monster, mugger, parodist, passionate, prankster, presumptuous, punner, punster, quipster, rantipole, rapist, red-hot, reparteeist, revolutionary, satirist, savage, scorching, she-wolf, spitfire, termagant, terror, terrorist, thoughtless, tiger, tigress, totally committed, tough, tough guy, ugly customer, violent, virago, vixen, wag, wagwit, white-hot, wild, wild beast, wild man, wild-ass, wisecracker, wit, witch, witling, wolf, zany, zealous