/ˌɪn.ɪɡˈzɑː.stə.bəl/
If there is an inexhaustible supply of something, there is so much of it that it cannot all be used up.
that cannot be exhausted (= finished); very great 用之不竭的；无穷无尽的
an inexhaustible supply of good jokes
讲不完的精彩笑话
Her energy is inexhaustible.
她有无穷的精力。