precipitous

1 acting or done with excessive or careless speed soon regretted our precipitous actions in international affairs Synonyms cursory, drive-by, flying, gadarene, headlong, helter-skelter, hurried, overhasty, pell-mell, precipitate, hasty, rash, rushedRelated Words breakneck, breathtaking; headstrong, heady, hotheaded, impatient, impetuous, impulsive, madcap, reckless, unadvised; quick, rapid, speedy, swift; horseback, impromptu, makeshift, offhand, offhanded, off-the-cuff, rush, slapdash, snap, spontaneous, spur-of-the-moment; abrupt, suddenNear Antonyms calculated, calculating, measured; circumspect, foresighted, forethoughtful; drawn-out, extended, long-term, prolonged; faltering, hesitant, hesitating, tentative; dallying, dawdling, laggard, leisurely, poky (or pokey), shilly-shallying, slowAntonyms deliberate, unhurried, unrushed

2 having an incline approaching the perpendicular a precipitous ski slope that fully merits its triple diamond designation Synonyms abrupt, bold, steep, sheerRelated Words perpendicular, plumb, straight, vertical; craggy, hillocky, hilly, mountainous, scarped; angled, canted, cocked, heeled, inclined, listed, slanted, sloped, tilted, tippedNear Antonyms gentle, gradual, moderate, soft; even, flat, flush, horizontal, level, plane, smooth, unruffled, unwrinkledAntonyms easy