1. (adverb) immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot
without delay or hesitation; with no time intervening
Synonyms: now, at one time, straight, at present, like a shot, instantly, instantaneously, in a flash, at once, outright, nowadays, at a time, today, direct, directly, forthwith, promptly, straight off, straightaway, right away, flat, immediately
2. (adverb) instantaneously, outright, instantly, in a flash
without any delay
Synonyms: now, right away, straightaway, instantaneously, like a shot, straight off, at once, directly, immediately, in a flash, instantly, outright, forthwith
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Synonyms and Antonyms of instantly 
