I. adjective
1.
acting, done, or expressed with undue haste or disregard for consequences
don't do anything rash
that was a very rash statement
Synonyms: brash, hasty, hotheaded, ill-advised, incautious, incogitant, inconsiderate, mad-brained, madcap, reckless, thoughtless, unadvised, unconsidered, unwary; compare careless 1
Related Word: abrupt, headlong, impetuous, precipitate, precipitous, sudden; foolhardy, foolish, impulsive, silly; careless, heedless, imprudent, indiscreet, injudicious, unthinking, unwise
Contrasted words: careful, cautious, chary, circumspect, wary; advised, considered, deliberate, designed, premeditated, studied; calm, cool, level-headed
Antonyms: calculating
2.
Synonyms: adventurous , adventuresome, audacious, daredevil, daring, foolhardy, reckless, temerarious, venturesome, venturous
II. noun
Synonyms: epidemic , outbreak, plague