unending

形容词 unending:

1. continuing forever or indefinitely
   同义词：ageless, aeonian, eonian, eternal, everlasting, perpetual, unceasing

1. I'm sick of your unending grumbles.
   我对你的不断埋怨感到厌烦。
2. The learning by memory of all the basic things one must know is a most incredible and unending effort.
   为了把那些基本的东西背诵下来并记住，花费的力气实在是无穷无尽，叫人难以置信。

un.end.ing

adj.（形容词）
Being or seeming to be without an end or limit; boundless.
无终止的，无止境的：是或者像是无止境的或不尽的；无限的

【引伸】
unend.ingly
adv.（副词）