形容词

1. 永久的;永恒的;永远的
Something that is eternal lasts for ever.

1. tiresomely long
seemingly without end

e.g. endless debates
an endless conversation
the wait seemed eternal
eternal quarreling
an interminable sermon

Synonym: endlessinterminable

2. continuing forever or indefinitely

e.g. the ageless themes of love and revenge
eternal truths
life everlasting
hell's perpetual fires
the unending bliss of heaven

Synonym: agelessaeonianeonianeverlastingperpetualunendingunceasing