33 entries under weak topic. ×
| ephemeral(adjective, light, unreliable, brief) | |
| insubstantial(adjective, light, slight, short) | |
| fanciful(adjective, light, slight, imaginary) | |
| fragile(light, slight, imaginary, flimsy) | |
| frail(light, slight, imaginary, flimsy) | |
| infirm(adjective, light, slight, imaginary) | |
| false(adjective, light, slight, thin) | |
| idle(light, moving, slight, unsettled) | |
| unsound(adjective, light, slight, thin) | |
| aerial(light, slight, imaginary, flimsy) | |
| airy(light, slight, imaginary, flimsy) | |
| chimerical(light, slight, imaginary, flimsy) | |
| decrepit(light, slight, imaginary, flimsy) | |
| feeble(light, slight, imaginary, flimsy) | |
| flimsy(light, slight, imaginary) | |
| illusory(light, slight, imaginary, flimsy) | |
| imaginary(light, slight, flimsy) | |
| immaterial(light, slight, imaginary, flimsy) | |
| imponderable(light, slight, imaginary, flimsy) | |
| incorporeal(light, slight, imaginary, flimsy) |
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| APA | Smart Define. (2016). fly-by-night thesaurus. Retrieved September 27, 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 27, 2026). |
| Harvard | Smart Define 2016, fly-by-night thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/fly-by-night/thesaurus/synonyms>. |
| MLA | Smart Define. "fly-by-night thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/fly-by-night/thesaurus/synonyms> |