1
flickering
1
fluctuant(adjective, uncertain, nervous, doubtful, shaky)
1
fluctuating(adjective, capricious)
1
for the time being
1
frivolous(adjective, capricious)
1
furtive(adjective, dishonest, deceitful, dubious, unpredictable)
1
halfhearted(adjective, irresolute)
1
here-today-gone-tomorrow(adjective, unreliable, shady)
1
hermit(exile, outlaw, outcast)
1
hopeless(adjective, unreliable, insecure, treacherous, incalculable)
1
hunted person(expression, exile, outlaw, outcast)
1
idle(light, weak, moving, slight, unsettled)
1
impetuous
1
improbable(uncertain, doubtful, unsure)
1
in a quandary(expression, adjective, idiom, uncertain, nervous)
1
inaccurate(adjective, careless, loose, sloppy, unpredictable)
1
incalculable(adjective, unreliable, insecure, treacherous)
1
indeterminate(adjective, loose, uncertain, nervous, doubtful)
1
insipid(adjective, irresolute)
1
instantaneous
10 years ago|3.8k views|share |citing 
APASmart Define. (2016). fly-by-night thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/fly-by-night/thesaurus/synonyms
ChicagoSmart Define. 2016. "fly-by-night thesaurus" https://smartdefine.org/fly-by-night/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, fly-by-night thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/fly-by-night/thesaurus/synonyms>.
MLASmart Define. "fly-by-night thesaurus" 26 February 2016. Web. 28 September 2026. <https://smartdefine.org/fly-by-night/thesaurus/synonyms>