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Definition of bottomless : Without a bottom; hence, fathomless; baseless; as, a bottomless abyss.

Synonyms:

true, groundless, unfounded, unwarranted, baseless, idle, unfathomable, unclothed

deep, profound, sunken, fathomless, abysmal

incalculable, unlimited, limitless, infinite, termless, everlasting, boundless, innumerable, illimitable, ceaseless, interminable, endless, immeasurable, countless, perpetual, timeless, unbounded, eternal, numberless, inexhaustible, immemorial

Usage examples:

• Gloria could see their figures dimly; they went down and down along a long, steep, slanting passage- way; they had smoking torches and looked like so many fiends in the bottomless pit. - "The Everlasting Whisper", Jackson Gregory.
• Happy was it for John that his brain did not give way in that lonely hour of bottomless despair. - "Jess", H. Rider Haggard.
• He would some day see the light and he would walk and run all the way from Crested Buttes to the Bottomless Pit and throw his da'aka in there and kneel at Jesus feet and call him Lord. - "The High Calling", Charles M. Sheldon.