IMPETUOUS

hastily or rashly energetic

impulsive and vehement

characterized by undue haste and lack of thought or deliberation
SYN - brainish, hotheaded, impulsive, mad cap, tear away

marked by violent force
ANT - cautious

"An impetuous display of spending and gambling"

"It was his impetuous behavior that night which had led to this impecunious state."

"She was so imperturbable and thoughtful she was the perfect balance for the impetuous Dan."

"His mother was scared because ever since he got this new car he displayed impetuous driving."

"It was almost as if he thought to be a man, meant acting in this impetuous way everyonce in a while - but it only made him look like an animal."