63 entries under underground topic. ×

23
obscure(adjective, cover, clear, rough, dark)
11
mysterious(adjective, obscure, dark, uncertain, doubtful)
9
clouded(adjective, clear, obscure, certain, uncertain)
7
unintelligible(adjective, obscure, rough, dark, uncertain)
6
abstruse(adjective, obscure, strange, uncertain, doubtful)
5
veiled(adjective, obscure, unknown, clandestine)
3
mystic(adjective, obscure, strange, uncertainty, vague)
3
recondite(obscure, dark, uncertain, mysterious, unknown)
2
arcane(adjective, obscure, deep, doubtful, vague)
2
hidden(adjective, cover, obscure, dark, doubtful)
2
reticent(adjective, obscure, deep, unknown, clandestine)
2
secret(adjective, obscure, dark, uncertain, mysterious)
2
shrouded(cover, obscure, dark, unknown, equivocal)
2
strange(obscure, deep, unknown, clandestine)
1
deep(obscure, unknown, clandestine, undisclosed)
1
discreet(adjective, careful, vague, wary, equivocal)
1
esoteric(obscure, unknown, clandestine, undisclosed)
1
hush-hush(careful, vague, wary, equivocal, clandestine)
1
mystical(obscure, unknown, clandestine, undisclosed)
1
undisclosed(cover, obscure, dark, unknown, equivocal)
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APASmart Define. (2016). ambiguous thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/ambiguous/thesaurus/synonyms
ChicagoSmart Define. 2016. "ambiguous thesaurus" https://smartdefine.org/ambiguous/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, ambiguous thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/ambiguous/thesaurus/synonyms>.
MLASmart Define. "ambiguous thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/ambiguous/thesaurus/synonyms>