Synonyms and related words :
a corps perdu, bang, bearishly, bluffly, bluntly, boorishly, brashly, brusquely, cavalierly, churlishly, crustily, curtly, dash, forthwith, gruffly, harshly, hastily, head over heels, headfirst, headforemost, headlong, heels over head, impetuously, impulsively, like a flash, like a thunderbolt, nastily, of a sudden, on short notice, plop, plump, plunk, pop, precipitantly, precipitately, precipitously, rashly, sharp, sharply, short, shortly, slap, slap-bang, smack, snippily, startlingly, sudden, suddenly, surprisingly, unawares, unexpectedly, without notice, without warning