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.
See how Edith Wharton uses "sempiternal", with its meaning, pronunciation and a real book example.
Examples from books
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