'fly-by-night' definitions:
Definition of 'fly-by-night'
From: WordNet
adjective
(of businesses and businessmen) unscrupulous; "a shady operation" [syn: fly-by-night, shady]
adjective
Ephemeral; "the symphony is no fly-by-night venture"
noun
A debtor who flees to avoid paying
Synonyms of 'fly-by-night'
From: Moby Thesaurus
- brittle,
- capricious,
- changeable,
- corruptible,
- deciduous,
- dying,
- ephemeral,
- evanescent,
- fading,
- fickle,
- fleeting,
- flitting,
- flying,
- fragile,
- frail,
- fugacious,
- fugitive,
- impermanent,
- impetuous,
- impulsive,
- inconstant,
- insubstantial,
- irresponsible,
- momentary,
- mortal,
- mutable,
- nondurable,
- nonpermanent,
- passing,
- perishable,
- short-lived,
- temporal,
- temporary,
- transient,
- transitive,
- transitory,
- trustless,
- undependable,
- undurable,
- unenduring,
- unfaithworthy,
- unreliable,
- unstable,
- unsure,
- untrustworthy,
- untrusty,
- volatile