acting or tending to act too hastily or without due consideration.

characterized by or showing too great haste or lack of consideration

rash promises.

adjective

careful , cautious , planned , thoughtful

adjective

adventurous , audacious , bold , brash , daring , determined , devil-may-care * , fiery , foolhardy , frenzied , furious , harebrained , hasty , headlong , headstrong , heedless , hotheaded , ill-advised , ill-considered , immature , impetuous , imprudent , incautious , indiscreet , injudicious , insuppressible , irrational , jumping to conclusions , madcap , overhasty , passionate , precipitant , precipitate , premature , reckless , thoughtless , unguarded , unthinking , unwary , venturesome , venturous , wildnotes:rash (the adjective) suggests imprudence and lack of forethought; reckless implies disregard of possible consequences , harum-scarum , improvident , impulsive , slapdash , temerarious , unconsidered , devil-may-care , gung ho , inconsiderate , presumptuous , trigger-happy , unadvised

noun

breakout , epidemic , eruption , flood , hives , pandemic , plague , series , spate , succession , wavenotes:rash (the adjective) suggests imprudence and lack of forethought; reckless implies disregard of possible consequences , abrupt , adventuresome , adventurous , assumption , audacity , bold , brash , careless , daring , desperate , efflorescence , effrontery , exanthema , foolhardy , foolish , hasty , headlong , headstrong , heady , heedless , hotheaded , impetuosity , impetuous , improvident , imprudent , impulsive , incautious , irrational , irresponsible , precipitate , precipitous , presumption , rashness , reckless , sudden , temerarious , temerity , thoughtless , unadvised , unthinking , unwary , unwise , venturesome , venturous , wave