Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adverbial instantly has 2 senses

• instantly(r = adv.all) at once, directly, forthwith, immediately, like a shot, now, right away, straight off, straightaway - 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!"
• instantly(r = adv.all) in a flash, instantaneously, outright - without any delay; "he was killed outright"

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

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

For further exploring for "instantly" in Webster Dictionary Online