fathomless

adjective

fath·​om·​less ˈfa-t͟həm-ləs 

: incapable of being fathomed : immeasurable

… fathomless powers of gravity and chemistry …

—Ralph Waldo Emerson

fathomlessly adverb

fathomlessness noun

Synonyms of fathomless

• infinite
• endless

Examples of fathomless in a Sentence

impresses everyone with her fathomless knowledge of wildcats

Recent Examples on the Web

Even with its unnecessary detours, Singing reaches this wild reverie in the end—a voice reclaimed to report, softly, from the fathomless depths of the human experience. — Linnie Greene, Pitchfork, 29 Apr. 2026

Glaciers of the Pleistocene epoch, which retreated about 14,000 years ago, left behind the rolling landscape of craggy granite peaks, sloping valleys, and fathomless lakes. — Alex Tzelnic, Outside Online, 6 June 2025

The government’s sporadic but incessant updating of agency rules and procedures have done little to stymie routine abuses of the 702 data—which is currently fathomless. — WIRED, 7 Nov. 2023

Their relationship climaxes with a verbal showdown late in the season that is almost unbearable to watch, as Sanada and Nishioka summon the fathomless love and respect underlying the confrontation. — Kristen Baldwin, EW.com, 27 Feb. 2024

Word History

First Known Use

1638, in the meaning defined above