unfathomable.
Impossible to fathom.
Meaning & usage
Impossible to fathom. Especially of depth: physically incapable of being measured; immeasurable.
Impossible to fathom. Impossible to grasp the extent of, or to fully know or understand.
The sheer number of warriors the enemy attacked with was unfathomable.
Where this word comes from
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).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.