Synonyms of fly-by-night

1 Syllable

brief

2 Syllables

slimy, shiftier, dubious, bandaid, trustless, slipshod, transient, fleeting, short-haul, short-run, shiftiest, cowboy, shifty, band-aid, shady, passing

3 Syllables

treacherous, unsure, deciduous, untrusty, unthorough, short-lived, slippery, vagabond

4 Syllables

improvised, untrustworthy, questionable, evanescent, unreliable, falsehearted, ephemeral, temporary, insubstantial, momentary, unethical, impermanent, uncareful

5 Syllables

disreputable, irresponsible, unprofessional, undependable, autoschediastic

6 Syllables

prevaricatory

8 Syllables

here-today-gone-tomorrow