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