PDQ, abruptly, apace, aphoristically, at once, briefly, brusquely, compendiously, concisely, crisply, curtly, decisively, directly, economically, expeditiously, forthwith, immediately, in brief compass, in no time, instanter, instantly, laconically, on the instant, on the spot, peremptorily, pithily, pointedly, precipitately, pretty damned quick, promptly, pronto, quickly, right away, right off, sententiously, shortly, smartly, sparely, speedily, straightaway, straightway, subito, succinctly, suddenly, swiftly, synoptically, tersely, with all speed, without delay, without further delay, without hesitation, without warning
conciseness, brevity, the soul of wit, laconism, Tacitus, ellipsis, syncope, abridgment, compression, epitome, monostich, brunch word, portmanteau word, concise, brief, short, terse, close, to the point, exact, neat, compact, compressed, condensed, pointed, laconic, curt, pithy, trenchant, summary, pregnant, compendious, succinct, elliptical, epigrammatic, quaint, crisp, sententious, concisely, briefly, summarily
, in brief, in short, in a word, in a few words, for shortness sake, to come to the point, to make a long story short, to cut the matter short, to be brief, it comes to this, the long and the short of it is, brevis esse laboro obscurus fio.
earliness, morning, punctuality, promptitude, haste, suddenness, prematurity, precocity, precipitation, anticipation, a stitch in time, early, prime, forward, prompt, summary, premature, precipitate, precocious, prevenient, anticipatory, rath, sudden, unexpected, near, near at hand, immediate, early, soon, anon, betimes, rath, eft, eftsoons, ere long, before long, shortly, beforehand, prematurely, precipitately, too soon, before its time, before one's time, in anticipation, unexpectedly, suddenly, before one can say 'Jack Robinson', at short notice, extempore, on the spur of the moment, on the spur of the occasion, at once, on the spot, on the instant, at sight, offhand, out of hand, a' vue d'oeil, straight, straightway, straightforth, forthwith, incontinently, summarily
, immediately, briefly, shortly, quickly, speedily, apace, before the ink is dry, almost immediately, presently at the first opportunity, in no long time, by and by, in a while, directly, no sooner said than done, immediately, if not sooner, tout vient a temps pour qui sait attendre.