无穷的；永恒的；可靠的；确实的；

1. He could not have succeeded without the unfailing support of his wife.
    若没有他妻子始终如一的支持，他是不可能成功的。

1. 经久不衰的：unfadingly 不褪色地 | unfailing 经久不衰的 | unfailingly 无穷尽地

2. 始终如一的：Sacrosnct:神圣不可侵犯的; | Unfailing:始终如一的; | Perfect:完美的,极好的;

3. 无尽的,无穷的：trustworthy 值得信赖的,可靠的 | unfailing 无尽的,无穷的 | unflappable 不惊慌的,镇定的

4. 永远不会让人失望的：unconcede 收回让步声明 | unfailing 永远不会让人失望的 | ungratefully 忘恩负义

1. unceasing

    e.g. unfailing loyalty
           unfailing good spirits
           unflagging courtesy

    Synonym: unflagging

2. always able to supply more

    e.g. an unfailing source of good stories
           a subject of unfailing interest

3. not liable to failure

    e.g. a foolproof identification system
           the unfailing sign of an amateur
           an unfailing test

    Synonym: foolproof