Synonyms:
bottomless
Meaning: extremely deep; "a bottomless pit"; "a bottomless lake"
Usage examples
I had not yet ventured to look down the bottomless pit into which I was about to take a plunge.
One can look hundreds of feet into caverns and gorges that seem almost like the bottomless pit.
Oh, then, a million curses take it--respectability, I mean; may it sink into the bottomless pit, and the smoke of its torment ascend for ever and ever!
In that costume he would have left nothing to be desired, if he had been further fitted out with a bottomless chair, a lantern, and a bunch of matches.