eternal

permanent, eternal, perpetual, everlasting, endless

形容词 eternal:

1. continuing forever or indefinitely
   同义词：ageless, aeonian, eonian, everlasting, perpetual, unending, unceasing
2. tiresomely long; seemingly without end
   同义词：endless, interminable

1. She felt eternal gratitude to him for saving her life.
   她终生感激他的救命之恩。
2. He is, as it were, an eternal boy.
   他好像是个永远年轻的小伙子。
3. The bad man will suffer eternal damnation.
   坏人将会受到永远的惩罚。
4. Condemned, especially to eternal punishment.
   被判为永久罪的被判罪的，尤其指永久的惩罚
5. The idea that the world is eternal is now seldom advanced.
   地球是永恒的这种看法现在很少提出了。

e.ter.nal

adj.（形容词）
Being without beginning or end; existing outside of time.See Synonyms at infinite
永恒的：无始无终的；永存的参见 infinite
Continuing without interruption; perpetual.
不断的；永恒的
Forever true or changeless:
不朽的：永远真实的或始终不变的：
例句：
eternal truths.
不朽的真理

Seemingly endless; interminable.See Synonyms at ageless See Synonyms at continual
似乎无休止的；没完没了的参见 ageless参见 continual
Of or relating to spiritual communion with God, especially in the afterlife.
永生的：永远与上帝同在的，尤指后世
n.（名词）
Something timeless, uninterrupted, or endless.
永恒的事物：无时间限制的、继续不断的或永恒的事物
Eternal God. Used withthe.
Eternal 上帝。与定冠词the 连用

来源：
Middle English
中古英语
from Old French
源自 古法语
from Late Latin aetern3lis
源自 后期拉丁语 aetern3lis
from Latin aeternus * see aiw-
源自 拉丁语 aeternus *参见 aiw-

【引伸】
e.ternal.ity
eter.nally
adv.（副词）