| distrustful(adjective, uncertain, nervous, doubtful, shaky) | |
| dodger(exile, outlaw, outcast) | |
| double-minded(adjective, irresolute) | |
| draft | |
| dubitable(uncertain, doubtful, unsure) | |
| duplicitous | |
| dying | |
| elastic | |
| ephemera | |
| error-prone(adjective, unreliable, insecure, treacherous, incalculable) | |
| escaper(exile, outlaw, outcast) | |
| evacuee(exile, outlaw, outcast) | |
| fairweather(adjective, unreliable, insecure, treacherous, incalculable) | |
| false(adjective, light, weak, slight, thin) | |
| far-fetched(uncertain, doubtful, unsure) | |
| fast and loose(adjective, unreliable, insecure, treacherous, incalculable) | |
| fishy(wrong, uncertain, immoral, doubtful, unsure) | |
| fitful(adjective, capricious) | |
| flashing | |
| fleet |
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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> |