33 entries under light topic. ×

11
ephemeral(adjective, weak, unreliable, brief)
3
insubstantial(adjective, weak, slight, short)
2
fanciful(adjective, weak, slight, imaginary)
2
fragile(weak, slight, imaginary, flimsy)
2
frail(weak, slight, imaginary, flimsy)
2
infirm(adjective, weak, slight, imaginary)
2
weak(adjective, slight, thin, uncertain)
1
false(adjective, weak, slight, thin)
1
idle(weak, moving, slight, unsettled)
1
unsound(adjective, weak, slight, thin)
0
aerial(weak, slight, imaginary, flimsy)
0
airy(weak, slight, imaginary, flimsy)
0
chimerical(weak, slight, imaginary, flimsy)
0
decrepit(weak, slight, imaginary, flimsy)
0
feeble(weak, slight, imaginary, flimsy)
0
flimsy(weak, slight, imaginary)
0
illusory(weak, slight, imaginary, flimsy)
0
imaginary(weak, slight, flimsy)
0
immaterial(weak, slight, imaginary, flimsy)
0
imponderable(weak, slight, imaginary, flimsy)
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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>