inexhaustible

英 [ɪnɪg'zɔːstɪb(ə)l; ɪneg-] 美[,ɪnɪɡ'zɔstəbl]

1. that cannot be entirely consumed or used up;: "an inexhaustible supply of coal"

2. incapable of being entirely consumed or used up;: "an inexhaustible supply of coal"