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"