Sempiternal

sɛmˈpɪtərnəl

adjective

eternal, everlasting, infinite in duration

The word 'sempiternal' comes from the Latin word 'sempiternus', which means 'everlasting'. It is used to describe something that is unending or eternal, often in a poetic or philosophical context.

There he sat, behind his sempiternal cigar, glowering into the tender spaces of the sky as if what he saw there were an offense to the human race; yet Halo wondered if one could say of those small deep-sunk eyes, forever watchful behind their old-fashioned pince-nez, that anything they rested on escaped them.

Edith Wharton

Hudson River Bracketed