[syn: instantaneously, outright, instantly, in a flash]
The Collaborative International Dictionary of English v.0.48:
Instantly \In"stant*ly\, adv.
1. Without the least delay or interval; at once; immediately.
2. With urgency or importunity; earnestly; pressingly. "They
besought him instantly." --Luke vii. 4.
Syn: Directly; immediately; at once. See Directly.
WordNet (r) 3.0 (2006):
adv 1: without delay or hesitation; with no time intervening;
"he answered immediately"; "found an answer
straightaway"; "an official accused of dishonesty should
be suspended forthwith"; "Come here now!" [syn:
immediately, instantly, straightaway, straight
off, directly, now, right away, at once,
forthwith, like a shot]
2: without any delay; "he was killed outright" [syn:
instantaneously, outright, instantly, in a flash]
Moby Thesaurus II by Grady Ward, 1.0:
59 Moby Thesaurus words for "instantly":
PDQ, amain, apace, at once, away, by forced marches, cursorily,
decisively, directly, expeditiously, feverishly, forthwith,
furiously, hand over fist, hastily, helter-skelter, hotfoot,
hurriedly, hurry-scurry, immediately, in no time, in passing,
instantaneously, instanter, just now, just then, momentaneously,
momentarily, momently, now, on the dot, on the instant,
on the nail, on the run, on the spot, pell-mell,
pretty damned quick, promptly, pronto, quickly, right, right away,
right off, slapdash, smartly, speedily, straightaway, straightway,
subito, summarily, superficially, swiftly, with a rush,
with all haste, with all speed, with dispatch, with haste,
without delay, without further delay