The smallest things can be bottomless sources of joy.

The narcissists, voracious need to feed is bottomless.

of despair that seem all but bottomless.

All the way to bottomless appetite incarnates.

They burn bottomless cauldrons fueled by an ancient wrath, bubbling and boiling.

I purchased this so-called bottomless cup of soda not 10 minutes ago, and yet I was barely out of the door when I discovered this!

Bottomless just means you can refill it as much as you like.

and in the end they'll be shackled and thrown into the bottomless pit by God—

Schools had found a seemingly  bottomless source of income.  

He'll just throw in excessive hardening abilities, and it's bottomless rage.

You can give the spirit a bottomless barrel and sneak away while it tries to figure out how to use it.