inexhaustible

adj

1. (not-comparable)Impossible to exhaust; unlimited.

   “Henriette and Marie de Mancini, his former inexhaustible themes, seemed to have entirely escaped his memory.”

   “[I]t would not be very much less absurd for someone to write about New York City after having spent only a few years or a few decades in this metropolis of inexhaustible adventure, of terrifying emotional fecundity, of uncapturable character.”