rash

Synonyms: adventurous audacious bold brash daring determined devil-may-care fiery foolhardy frenzied furious harebrained hasty headlong headstrong heedless hotheaded ill-advised illconsidered immature impetuous imprudent incautious indiscreet injudicious insuppressible irrational jumping to conclusions madcap overhasty passionate precipitant precipitate premature reckless thoughtless unguarded unthinking unwary venturesome venturous wild

Antonyms: careful cautious planned thoughtful

Synonyms: breakout epidemic eruption flood hives pandemic plague series spate succession wave