Synonyms and related words :
abrupt, amazing, astonishing, astounding, breathtaking, confounding, electrifying, eye-opening, hasty, headlong, impetuous, impulsive, jarring, jolting, mind-boggling, miraculous, nerve-shattering, overwhelming, precipitant, precipitate, precipitous, prodigious, quick, shocking, spectacular, speedy, staggering, startling, stunning, stupendous, sudden, swift, unanticipated, unexpected, unforeseen, unlooked-for, unpredicted, wondrous