Definition of instantly:
pronto, instantaneously, right now, incontinently, right off, right away, directly, straight off, instant, now, today, presently, in a flash, like a shot, flat, nowadays, outright, without delay, at once, forthwith, immediately, on-the-spot, direct, straightway, right, plumb, in real time, at present, at a time, at one time, this instant, bang, time, fast, first off, spontaneously, PDQ, straight, headlong, straightaway, instanter.
- punctually (part of speech: adverb)
- timelessly (part of speech: adverb)
- suddenly (part of speech: adverb)