adjective
- not exhaustible; incapable of being depleted: an inexhaustible supply.
- untiring; tireless: an inexhaustible runner.
adjective
- incapable of being used up; endlessinexhaustible patience
- incapable or apparently incapable of becoming tired; tireless
c.1600, from in- (1) “not, opposite of” + exhaustible (see exhaust). Related: Inexhaustibly.