Adjective
Not be exhausted; inexhaustible; as, an exhaustless fund or store.
Source: Webster's dictionaryWe serve Him most who take the most of His exhaustless love. Alice Cary
We have not put our trust in Kings; let us not put it in natural resources, but grasp the truth that exhaustless wealth lies in the latent and as yet undeveloped capacities of individuals, of corporations, of States. Harrington Emerson