Synonyms of fly by night

Noun

1. fly-by-night, debtor, debitor

usage: a debtor who flees to avoid paying

Adjective

1. fly-by-night, shady, untrustworthy (vs. trustworthy), untrusty

usage: (of businesses and businessmen) unscrupulous; "a shady operation"

2. fly-by-night, impermanent (vs. permanent), temporary

usage: ephemeral; "the symphony is no fly-by-night venture"