12
abysmal(adjective, wide, unfathomable)
10
deep(adjective, down, far, unfathomable)
10
unfathomable
8
bottomless
5
cavernous(adjective, wide, unfathomable)
4
yawning(adjective, wide)
4
gaping(adjective, wide)
4
immeasurable(adjective, unfathomable)
4
seabed
4
unfathomed
3
deep sea(expression, idiom)
3
marine(adjective, sea)
3
ocean floor
3
profound
2
ocean bottom
2
sea bottom
2
unlimited
1
Davy Jones's locker
1
Neptunian
1
aquatic(adjective, sea, marine, salty, shore)
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APASmart Define. (2015). abyssal thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/abyssal/thesaurus/synonyms
ChicagoSmart Define. 2015. "abyssal thesaurus" https://smartdefine.org/abyssal/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, abyssal thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/abyssal/thesaurus/synonyms>.
MLASmart Define. "abyssal thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/abyssal/thesaurus/synonyms>