"bottomless source" is correct and can be used in written English.
It is an idiom that refers to something seemingly endless or without limit. Examples include: "Her determination to succeed was a bottomless source of energy." "We have a bottomless source of ideas to improve our product."
Connoisseurs of penitence find The Times a bottomless source of amusement.
A thin, flat, cordless, bottomless source of free, great TV shows, in your bag or on the bedside table?
New York, for Mr. Kollek is a bottomless source for novelistic -- some might even say occasionally offensive -- observations about people, particularly women.
The drinks he offers are 70s drinks, stage-business drinks, unrefrigerated drinks offered from a sideboard, or a clump of bottles on a round silver tray; drinks are the bottomless source of filler-dialogue to keep things moving.
It's generally believed that all potentially offensive jokes lose their sting when wielded by those they are directed against, and Iranian-born Omid Djalili now has a bottomless source of 'if you don't laugh I'll detonate a device under my shirt' jokes at his disposal.
Likewise, despite new links with Russia, it doesn't know how long it can depend on that country as a bottomless source of oil.
The British cut off access to cheap molasses, while the nation's rapidly expanding interior gave Americans a near-bottomless source of grain, which they used to make whiskey.
But enthusiasm for this seemingly bottomless funding source has gone too far.
Goodbye to the little guy The rise and fall of Martin Ebner It's hell out there Big bender Stick beats carrot Argentina's bottomless pit ReprintsAnother source of comfort is that banks seem to have learnt that lending wildly to property developers always ends in disaster.
Ms. Rashad, after all, reigns in the American imagination as one of the ultimate wholesome maternal figures, a source of bottomless reassurance.
Still, we're talking parasites here, and parasitism is an evolutionary force to be reckoned with, a source of nearly bottomless cunning and breathtaking bio-inventiveness.
