Synonyms of lickety-split

1 Syllable
speed, soon, fast
2 Syllables
promptly, flat-out, swiftly, jiffy, soonest, quickly, sooner, fleetly
3 Syllables
snappily, rapidly, punctually, hastily, posthaste
5 Syllables
expeditiously
6 Syllables
precipitately
7 Syllables
unpremeditatedly