bottomless well

On the bright side, other studies have found that TV can at least be a short-term cure for that bottomless well of loneliness.

A dainty lip means a short purse-string, and a sick woman's fancy is a bottomless well.

It is like a bottomless well: you can always find fresh truths gushing forth from its pages.

Every newspaper, in its early days, swallows up money like a bottomless well.

You have dug a bottomless well, so I may say, at the foot of the ladder by which your friend Jack was preparing to mount.

The shallow concave of a hand-basin is as the shadow of the bottomless well.