inexhaustible

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in·ex·haust·i·ble / ˌinigˈzôstəbəl/ • adj. (of an amount or supply of something) unable to be used up because existing in abundance: his inexhaustible energy.DERIVATIVES: in·ex·haust·i·bil·i·ty / -ˌzôstəˈbilitē/ n.in·ex·haust·i·bly / -blē/ adv.