Synonyms of fly-by-night in English:

fly-by-night


See definition of fly-by-night

adjective

1‘sometimes these fly-by-night contractors take off without paying us at all’

SYNONYMS
unreliable, undependable, irresponsible, untrustworthy
dishonest, deceitful, not to be trusted, dubious, double-dealing, treacherous, traitorous, two-faced, unfaithful, duplicitous, dishonourable, unprincipled, unscrupulous, corrupt, underhand
informal iffy, shady, shifty, slippery, crooked
British informal dodgy, bent
Australian, New Zealand informal shonky
ANTONYMS

reputable