inexhaustible

[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

inexhaustibility, inexhaustibleness, noun
inexhaustibly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inexhaustible (ˌɪnɪɡˈzɔːstəbəl)
 
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
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Example sentences
Because it's so plentiful in nature, it's virtually inexhaustible.
All that is required is the infrastructure, the fuel is free and inexhaustible.
Eternal and inexhaustible gravity power is the future path for us in my opinion.
If cold fusion worked, it could provide an inexhaustible supply of clean energy.
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