madcap

(s) characterized by undue haste and lack of thought or deliberation
- a hotheaded decision
- liable to such impulsive acts as hugging strangers
- an impetuous display of spending and gambling
- madcap escapades; ("brainish" is archaic)
brainish, impetuous, tearaway, hotheaded, impulsive,

Nouns

(n) a reckless impetuous irresponsible person daredevil, harum-scarum, swashbuckler, hothead, lunatic,

Synonyms

brainish impetuous tearaway hotheaded impulsive daredevil harum-scarum swashbuckler hothead lunatic

Words of close approximity