timeless

adjective

existing/operating outside of/without reference to time

Wiktionary

adj

Etymology: Etymology tree Proto-Indo-European *deh₂-der. Proto-Indo-European *deh₂y- Proto-Indo-European *-mṓ Proto-Indo-European *dh₂i-mon- Proto-Germanic *tīmô Proto-West Germanic *tīmō Old English tīma Middle English tyme English time Proto-Indo-European *lewh₁- Proto-Indo-European *lewHs-der. Proto-Germanic *leusaną Proto-Germanic *lausaz Proto-Germanic *-lausaz Proto-West Germanic *-laus Old English -lēas Middle English -les English -less English timeless From time + -less.

Eternal.
“When Worlds, that count his Circles now, unhing’d, (Fate the loud Signal sounding) headlong rush To timeless Night and Chaos, whence they rose.”
Not affected by time; ageless.
Done at an improper time; unseasonable; untimely.
“Must I behold thy timeless, cruel death?”
“The lamp of day is quench’d beneath the deep, And soft approach the balmy hours of sleep: Nor fits it to prolong the heav’nly feast Timeless, indecent, but retire to rest.”
Not decreasing over time in quality and appeal.
“The cave carvings have a timeless beauty.”
Without a time limit; untimed.
“a timeless cricket match”
Outside of time; extratemporal.

noun

A gene encoding an essential protein that regulates circadian rhythm, normally written in italics: timeless.