hastyEnglishOxford American Thesaurushasty adjective 1 Fran took several hasty steps backwards: quick, hurried, fast, swift, rapid, speedy, brisk, hurrying, expeditious; cursory, perfunctory, brief, short, fleeting, passing, flying, transitory; literary fleet, rathe. ▷antonyms slow. 2 hasty decisions: rash, impetuous, impulsive, reckless, precipitate, precipitous, incautious, imprudent, spur-of-the-moment, premature, ill-considered, unconsidered, unthinking, ill-advised, ill-judged, injudicious; rare temerarious. ▷antonyms considered.