Added 9 October 2026
unfathomable
/(ˌ)ʌnˈfæðəməbl̩/ adjective
In Latin: abyssālis Wiktionary
adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about unfathomable at Wordnik → Where our words come from →
- Of depth; not capable of being sounded or measured.
-
Resembling an abyss in depth; so deep as to be unmeasurable.
the abyssal depths of the ocean
- Incapable of being fully understood.
Origin
From un- (prefix meaning ‘not’) + fathom (“to measure the depth of (water); (figurative) to deeply understand (someone or something)”) + -able (suffix forming adjectives denoting things not able or fit to be done).
From Wiktionary, via Kaikki.org (CC BY-SA)