All fly-by-night synonyms

adj fly-by-night

• passing — going by or past; elapsing: He was feeling better with each passing day.
• temporary — an office worker hired, usually through an agency on a per diem basis, for a short period of time.
• brief — Something that is brief lasts for only a short time.
• cowboy — A cowboy is a male character in a western.
• disreputable — not reputable; having a bad reputation: a disreputable barroom.
• dubious — doubtful; marked by or occasioning doubt: a dubious reply.
• fleeting — swift; rapid: to be fleet of foot; a fleet horse.
• impermanent — not permanent or enduring; transitory.
• irresponsible — said, done, or characterized by a lack of a sense of responsibility: His refusal to work shows him to be completely irresponsible.
• momentary — lasting but a moment; very brief; fleeting: a momentary glimpse.
• questionable — of doubtful propriety, honesty, morality, respectability, etc.: questionable activities; in questionable taste.
• shady — abounding in shade; shaded: shady paths.
• shifty — resourceful; fertile in expedients.
• short-lived — living or lasting only a little while.
• slimy — of or like slime.
• slippery — tending or liable to cause slipping or sliding, as ice, oil, a wet surface, etc.: a slippery road.
• treacherous — characterized by faithlessness or readiness to betray trust; traitorous.
• undependable — capable of being depended on; worthy of trust; reliable: a dependable employee.
• unprofessional — not professional; not pertaining to or characteristic of a profession.
• unreliable — not reliable; not to be relied or depended on.
• unsure — not certain or confident: He arrived at the party unsure of his welcome.
• untrustworthy — deserving of trust or confidence; dependable; reliable: The treasurer was not entirely trustworthy.
• trustless — not worthy of trust; faithless; unreliable; false: He was trustless when money was involved.