| rootless(adjective, moving, uncertain, nervous, idle) | |
| scatterbrained(adjective, careless, immoral, thoughtless, reckless) | |
| shaky(adjective, unreliable, insecure, treacherous, incalculable) | |
| slimy(adjective, informal, unreliable, shady) | |
| suspect(uncertain, doubtful, unsure) | |
| unaccountable(adjective, madcap, feckless, irresponsive) | |
| undecided(adjective, uncertain, nervous, doubtful, insecure) | |
| weak(adjective, light, slight, thin, uncertain) | |
| accident-sensitive(adjective, unreliable, insecure, treacherous, incalculable) | |
| acting | |
| ad interim | |
| alternate | |
| ambivalent(adjective, irresolute) | |
| arbitrary(adjective, capricious) | |
| arguable(uncertain, doubtful, unsure) | |
| awhile | |
| betwixt and between(expression, adjective, idiom, uncertain, nervous) | |
| bolter(exile, outlaw, outcast) | |
| borderline(adjective, uncertain, nervous, doubtful, shaky) | |
| bout |
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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> |