Synonyms of instantly

1 Syllable
right, soon, pdq, now
2 Syllables
promptly, straightly, away, soonest, quickly, sooner, amain, forthwith, pronto
3 Syllables
lineally, instanter, directly, punctually, straightaway, double-time
4 Syllables
spontaneously, contiguously
5 Syllables
immediately, instantaneously, momentarily