形容詞 inexhaustible:

1. that cannot be entirely consumed or used up
   同義詞：unlimited
2. incapable of being entirely consumed or used up

1. I shall die again and again to know that life is inexhaustible.
   我將死了又死，以明白生是無(wú)窮無(wú)盡的。
2. He is immortal, not because he alone among creatures has an inexhaustible voice, but because he has a soul, a spirit capable of compassion, and sacrifice, and endurance.
   人類不朽不是因?yàn)樵谌f(wàn)物中唯有他能永遠(yuǎn)發(fā)言、而是因?yàn)樗徐`魂，有同情心、有犧牲和忍耐精神。
3. An inexhaustible supply of coal.
   用之不竭的煤炭供應(yīng)
4. That from the last ding-dong of doom and clang had faded from the last worthless rock hanging tireless in the last red and dying evening, that even then, there will be one more sound, that of his puny and inexhaustible voice still talking.
   說(shuō)即使最后一次鐘聲已經(jīng)消失，消失的再也沒(méi)有潮水沖刷的映在落日余暉里的海上最后一塊無(wú)用礁石之旁時(shí)，還會(huì)有一個(gè)聲音，人類微弱的、不斷的說(shuō)話聲，這也很容易。

in.ex.haust.i.ble

adj.（形容詞）
That cannot be entirely consumed or used up:
無(wú)窮盡的：用不完或消耗不掉的：
例句：
an inexhaustible supply of coal.
用之不竭的煤炭供應(yīng)

Never wearying; tireless:
不倦的：從不感到累的；不知疲倦的：
例句：
an inexhaustible campaigner.
有耐性的競(jìng)選者

【引伸】
in.exhaust.ibil.ity 或
in.exhaust.ibleness
n.（名詞）
in.exhaust.ibly
adv.（副詞）