in·ex·haust·i·ble

[in-ig-zaws-tuh-buhl]
adjective
1.
not exhaustible; incapable of being depleted: an inexhaustible supply.
2.
untiring; tireless: an inexhaustible runner.

Origin:
1595–1605; < Latin inexhaust(us) not exhausted (see in-3, exhaust) + -ible

in·ex·haust·i·bil·i·ty, in·ex·haust·i·ble·ness, noun
in·ex·haust·i·bly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
inexhaustible (ˌɪnɪɡˈzɔːstəbəl) [Click for IPA pronunciation guide]
 
adj
1.  incapable of being used up; endless: inexhaustible patience
2.  incapable or apparently incapable of becoming tired; tireless
 
inexhausti'bility
 
n
 
inex'haustibleness
 
n
 
inex'haustibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Inexhaustible is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
the offspring of a zebra and a donkey.
Example sentences
Theoretically, a perfect photograph is absolutely inexhaustible.
Peaking capability is not inexhaustible, however, and there may come a time
  when there is a need for peak capacity additions.
Wind energy is an inexhaustible renewable energy source.
Eternal and inexhaustible gravity power is the future path for us in my opinion.
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