Synonyms for Fathomless:

adj.

abysmal (adjective)
bottomless.
deep (adjective)
unfathomable, deep, bottomless, abysmal, profound, sunken.
profound (adjective)
deep.
unintelligible (adjective)
incomprehensible.

n.

intricate, incomprehensible, difficult, contorted, confused, involved, complex, elaborate, confusing, complicated. knee-deep, deeply, come down, bottommost, depth, fathom. fathomless (noun)
unfathomable, bottomless.

Other synonyms:

deeply, bottommost. knee-deep, fathom. depth. come down. Other relevant words:
unfathomable, incomprehensible, knee-deep, depth, fathom.

Usage examples for fathomless

  1. Madeline, with her lithe grace of form, her pure pale complexion lit up by those fathomless brown eyes, and rendering more noticeable and beautiful the tiny rosy mouth, with its satellite dimples; with such wee white, blue- veined hands, and such a clear ringing, yet marvelously sweet voice. – Madeline Payne, the Detective's Daughter by Lawrence L. Lynch
  2. Oh, joys unmix'd, and fathomless delight! – The Poetical Works of Edward Young, Volume 2 by Edward Young
  3. Thou wilt not taste life till thou hast sipped the nectar from a pair of rose- red lips- thou shalt not guess the riddle of the stars till thou hast gazed deep down into the fathomless glory of a maiden's eyes- thou canst not know delight till thou hast clasped eager arms round a coy waist and heard the beating of a passionate heart against thine own! – Vendetta A Story of One Forgotten by Marie Corelli