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Longman Dictionary of Contemporary English
fathomless
adjective
EXAMPLES FROM CORPUS
▪ For a long moment all she could do was stare back at him, his dark fathomless eyes holding her in thrall.
▪ Refugee camps came into being, people were uprooted, the economy lagged behind and you created fathomless sadness.
▪ She lay limply in his arms, those cloudy, fathomless eyes gazing up into his.
▪ The fifteen girls across the bar turned their eyes on him with identical expressions of bland, fathomless contempt.
▪ The grin vanished like magic, her whole body stiffening in antipathy as her eyes locked with fathomless brown ones.
▪ Who would sleep with need as strong as his, with loneliness of such fathomless depth?
The Collaborative International Dictionary
Fathomless

Fathomless \Fath"om*less\, a.

  1. Incapable of being fathomed; immeasurable; that can not be sounded.

    And buckle in a waist most fathomless.
    --Shak.

  2. Incomprehensible.

    The fathomless absurdity.
    --Milton.

Douglas Harper's Etymology Dictionary
fathomless

1630s, literal ("bottomless"); 1640s, figurative ("not to be comprehended"); from fathom + -less.

Wiktionary
fathomless

a. 1 Very deep (especially of water deeper than a lead line can measure); bottomless. 2 (context by extension English) unfathomable or incomprehensible.

Usage examples of "fathomless".

To him the roaring tempest was mute, the boiling and hissing lake had no horrors, and he had plunged into the fathomless Leman as recklessly as he could have leaped to land.

They had forced their guns and wagons up rocks and down fathomless abysses, along sidelings and across gullies till they could not extricate themselves.

Only Maslin stared with fascination into those fathomless wells of blue, and his laboured breathing began to ease.

We must therefore take the Unity as infinite not in measureless extension or numerable quantity but in fathomless depths of power.

The summer had arrived in glory, trailing fathomless skies and green and gold and particolour as fresh as sunrise, yet death was about, twice.

Then, as I playfully shook him and turned him around, I felt the strangling tendrils of a cancerous horror whose roots reached into illimitable pasts and fathomless abysms of the night that broods beyond time.

There was no uncertainty in his voice, his eyes were now fathomless pools of sherry, meeting her gaze fully, dead-on, in the manner of a practiced cardplayer, and her will seemed to weaken immeasurably.

In a bog the greenest spots are the most dangerous, and Zoe knew it: the matted roots might be afloat on a fathomless depth of water.

That you should refuse the society of a gentleman like my friend for the sake of such a low fellow as Sibley, is to us all a disgusting and fathomless mystery.

For all we knew we were moving along an upthrust strip of rock no wider than our two feet, with fathomless abysses on either side.

XIV Thus speaking, the trooped apparitions Began to disband And resolve them in two: Those whose record was lovely and true Bore to northward for home: those of bitter traditions Again left the land, XV And, towering to seaward in legions, They paused at a spot Overbending the Race - That engulphing, ghast, sinister place - Whither headlong they plunged, to the fathomless regions Of myriads forgot.

The night sky was cloudless now, brilliant with diamantine stars, little chips of frozen fire in the dark velvet of that fathomless floor.

It hung on to his forehead, and his eyes were dark and fathomless as pools of coal tar - and Isabella understood why her mother had been afraid.

But certain rumors, that had been passed in a whisper to Harry by the abbot, said that it involved a coding system of fathomless complexity, and required receiving and transmitting a lot of optelectronic signals.

He saw that in this dusty and fathomless matter of learning the true name of every place, thing, and being, the power he wanted lay like a jewel at the bottom of a dry well.