4
indistinguishable(adjective, unclear, hazy, indistinct, indeterminate)
4
insubstantial(fake, false, imaginary, fanciful, illusory)
4
shady(adjective, dull, dark, gloomy, dim)
4
unfixed
4
unformed(adjective, disorder, obscure, confusion, mess)
4
unlit(adjective, dull, dark, gloomy, dim)
3
equivocal(adjective, clear, certain, unclear, indistinct)
3
bleary(adjective, dull, obscure, dim, unclear)
3
clear as mud(expression, idiom, unintelligibility)
3
darkened(adjective, dull, dark, gloomy, dim)
3
dense(gloomy, gray, overcast, unintelligibility)
3
dirty(dark, gloomy, misty)
3
dusk(noun, adjective, dull, dark, gloomy)
3
imprecise(adjective, obscure, vague, confused, unclear)
3
inexplicit(adjective, clear, certain, ambiguous)
3
inorganic(disorder, confusion, mess, muddle, jumble)
3
somber(adjective, dull, dark, gloomy, dim)
3
subtle
3
tenuous(adjective, weak, thin)
3
undefined
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APASmart Define. (2016). nebulous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/nebulous/thesaurus/synonyms
ChicagoSmart Define. 2016. "nebulous thesaurus" https://smartdefine.org/nebulous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, nebulous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/nebulous/thesaurus/synonyms>.
MLASmart Define. "nebulous thesaurus" 29 February 2016. Web. 22 September 2026. <https://smartdefine.org/nebulous/thesaurus/synonyms>