Etymology
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inexhaustible (adj.)

c. 1600, from in- (1) "not, opposite of" + exhaustible (see exhaust (v.)). Perhaps modeled on French inexhaustible (15c.). Related: Inexhaustibly.

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Definitions of inexhaustible

inexhaustible (adj.)
that cannot be entirely consumed or used up;
an inexhaustible supply of coal
Synonyms: unlimited
inexhaustible (adj.)
incapable of being entirely consumed or used up;
an inexhaustible supply of coal
From wordnet.princeton.edu