suddenly

adv

1. unexpectedly, out of the blue, all of a sudden, abruptly, at once, on the spur of the moment, without warning; forthwith, promptly, expeditiously, with dispatch; instantly, instantaneously, Sl. P.D.Q., immediately; presto, at short notice, straightway, apace, posthaste, hotfoot.

2. rapidly, quickly, overnight; swiftly, speedily, briskly; hastily, hurriedly, precipitately, headlong, feverishly, pell-mell, helter-skelter.

3. fleetingly, briefly, momentarily, in an instant, in a flash, in a jiffy, in no time, in a trice, in the twinkling of an eye, Inf. before one can say "Jack Robinson."