- unfailing by WordNet
adjectiveNot liable to failure.usage: "a foolproof identification system"; "the...
- unending by WordNet
adjectiveContinuing forever or indefinitely.usage: "the ageless themes of love and...
- ageless by WordNet
adjectiveContinuing forever or indefinitely.usage: "the ageless themes of love and...
- unceasing by WordNet
adjectiveContinuing forever or indefinitely.usage: "the ageless themes of love and...
- perpetual by WordNet
adjectiveContinuing forever or indefinitely.usage: "the ageless themes of love and...