adjective. Behaving or acting impulsively or rashly; wild.

noun. 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.

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

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

adjective. Wild; reckless.

adjective. impulsive, hasty or reckless; capricious.

noun. An impulsive, hasty, capricious person.

noun. An insane person, a lunatic.

adjective. characterized by undue haste and lack of thought or deliberation

noun. a reckless impetuous irresponsible person

"Aug. 3 Bloomberg -- Governor Zhou Xiaochuan said China's central bank will monitor U.S. efforts to tackle its debt as the official Chinese news agency criticized what it called the "madcap" brinksmanship of American lawmakers."

incautious  

adventuresome  blithe  boisterous  carefree  carousal  

Mafioso  Young Turk  adventurer  adventuress  adventurous