30 entries under adjective topic. ×

1
unimaginable(unfathomable, impenetrable, opaque, unintelligible)
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baseless
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eternal
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extending deeply(expression, bottomless)
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plumbless
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plummetless
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recondite
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subaqueous(low-set, low-lying, subjacent)
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unplumbed
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usually down(expression, subaqueous)
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APASmart Define. (2015). fathomless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fathomless/thesaurus/synonyms
ChicagoSmart Define. 2015. "fathomless thesaurus" https://smartdefine.org/fathomless/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, fathomless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fathomless/thesaurus/synonyms>.
MLASmart Define. "fathomless thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/fathomless/thesaurus/synonyms>