from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective That cannot be entirely consumed or used up.
- adjective Never wearying; tireless.
from The Century Dictionary.
- Not exhaustible; incapable of being exhausted, spent, or wearied; unfailing: as, an inexhaustible supply of water; inexhaustible patience.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Incapable of being exhausted, emptied, or used up; unfailing; not to be wasted or spent
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Impossible to
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective incapable of being entirely consumed or used up
- adjective that cannot be entirely consumed or used up
from Wiktionary, Creative Commons Attribution/Share-Alike License
_boundless_ steppes of the south an inexhaustible pasturage to present (54) _inexhaustible_ those nomad tribes whose numerous fields of pasturage, and give and incomparable horsemen form the birth to those nomad tribes, in chief defence of the empire. whose numerous and incomparable horsemen the chief defence of the empire,  as of all Oriental states, (15 _a_) _is to be found_.
But there is no doubt that the term inexhaustible can with justice be applied to its stores.
The Great South; A Record of Journeys in Louisiana, Texas, the Indian Territory, Missouri, Arkansas, Mississippi, Alabama, Georgia, Florida, South Carolina, North Carolina, Kentucky, Tennessee, Virginia, West Virginia, and Maryland
By doing so, you made it possible for nitrogen to be made available to mankind in inexhaustible quantities, in a form suitable for agriculture, and even at lower prices than hitherto.
This, though not inexhaustible, is at least ample to permit a long-term experiment in training agriculturists how to use phosphorus and other mineral fertilizers properly and systematically.
She was skinny, almost emaciated, with breasts consisting of little more than nipples, and her behind was flat, but her vulva could only be called inexhaustible.
Testament, as this out of the history of the Old) with new songs, with fresh thoughts -- so copious, so various, so inexhaustible is the subject.
These, then, are the two great combustibles, the two parents of fire; and as nature has lavished them upon us in what we may call inexhaustible quantities; when you hear people lamenting and saying that wood is disappearing, that coal is diminishing, and that the human race will end by not knowing how to warm themselves, do not disturb yourself in the least.
The "inexhaustible" springs dried up, and the crops that were planted were raided by neighboring Indians.
If in due course we succeed, fusion power would assure mankind of inexhaustible power so long as he survives.
Here "inexhaustible" is inconsistent with what follows.