from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Too deep to be fathomed or measured.
  • adjective Too obscure or complicated to be understood.

from The Century Dictionary.

  • Incapable of being embraced or encompassed with the arms.
  • Having a depth so great that it cannot be fathomed; bottomless.
  • Not to be penetrated by thought or comprehended.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Incapable of being fathomed; immeasurable; that can not be sounded.
  • adjective Incomprehensible.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Very deep (especially of water deeper than a lead line can measure); bottomless
  • adjective by extension unfathomable or incomprehensible


Sorry, no etymologies found.


  • Reading her books had offered him a peek inside her fathomless brain, so he knew she was clever enough to wrap him entirely about her finger if he allowed it.

    How to Woo a Reluctant Lady

  • And I am forever a dolphin in blue sleepless waves, swimming toward a distant fathomless light.

    The Memory Palace

  • The spirit of fathomless self-rebuke would spread to America during the Vietnam era, when defeat was almost welcomed as the penalty for America's many sins.

    Parallel Lives

  • Here too that the usual Bloomian oracular tone is established in fathomless aperçus: "Literature for me is not merely the best part of life; it is itself the form of life, which has no other form."

    The Anatomy of Influence by Harold Bloom – review

  • One of Márai's contemporaries, the great Hungarian poet Sándor Weöres, expressed the frightening sense of something dark and fathomless beneath our busy lives.

    A Hungarian Novelist's Literature of Fidelity

  • He is ably assisted, of course, by the fathomless whiteness that surrounds his characters, and swallows up moral uncertainty like a seal eating a fish.

    'Undefeated': Real School Football (Almost)

  • They liked to believe that King Minos of Crete, their mythical enemy from some even older past, had hidden a hellish monster that devoured the flower of Greek youth in the fathomless Labyrinth set below the palace of Knossos.

    From Hitler to Gaddafi: dictators and their bunkers

  • It is indeed a fathomless mystery of theology, and even if I were theologian enough to deal with it directly, it would not be relevant to do so here.

    Matthew Yglesias » The Gaza Tunnels

  • Adrian Wilson couldn't quite bring himself to acknowledge the depths of fathomless futility.

    No mirage: Warner basking as Cards head to first Super Bowl

  • It was the world, with a fathomless past and boundaries that were over the horizon.

    Point of View in Fiction


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  • "I am the mate and companion of people, all just as immortal and fathomless as myself," Whitman, Song of Myself, 7

    January 4, 2008

  • My fingers annoy each other

    And my eyebrows are two confronting foes.

    I want to twist my body like a wire

    In a very desolate cemetery,

    And fall down a fathomless well

    Full of monsters, mothers and bracelets.

    - Mohamed Al-Maghout, 'Stars and Rains'.

    September 16, 2008