- Definitions|1
- Thesaurus|169
- Abbreviations|0
| unclear(incoherent, unfathomable, incomprehensible, impenetrable, opaque) | |
| uncomprehensible(adjective, incomprehensible) | |
| unimaginable(adjective, unfathomable, impenetrable, opaque, unintelligible) | |
| unknowable(incoherent, unfathomable, incomprehensible, impenetrable, opaque) | |
| after(low-set, low-lying) | |
| back of(expression, low-set, low-lying) | |
| baseless | |
| bathycolpian | |
| below(low-set, low-lying) | |
| benthal | |
| benthopelagic | |
| bottommost(low-set, low-lying, subjacent) | |
| buried | |
| depth | |
| endless | |
| eternal | |
| extending deeply(expression, adjective, bottomless) | |
| fathom | |
| ground-level(low-set, low-lying, subjacent) | |
| hard to understand(expression, idiom) |
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| APA | Smart Define. (2015). fathomless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fathomless/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fathomless thesaurus" https://smartdefine.org/fathomless/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, fathomless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fathomless/thesaurus/synonyms>. |
| MLA | Smart Define. "fathomless thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/fathomless/thesaurus/synonyms> |