An example of inexhaustible is energy captured and stored from the sun.
- that cannot be used up or emptied
- that cannot be tired out; tireless
- That cannot be entirely consumed or used up: an inexhaustible supply of coal.
- Never wearying; tireless: an inexhaustible campaigner.
- in′ex·haust′i·bil′i·ty, in′ex·haust′i·ble·ness