Adjective: inexhaustible ,i-nig'zos-tu-bul or ,in-eg'zos-tu-bul
- Incapable of being entirely consumed or used up
"an inexhaustible supply of coal";
- unlimited
- Showing sustained enthusiastic action without obvious tiredness
"an inexhaustible advocate of equal rights";
- indefatigable, tireless, unflagging, unwearying
See also: energetic, infinite, renewable, unfailing
Antonym: exhaustible