Added 10 October 2026 timeless adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). More about timeless at Wordnik → Where our words come from → Eternal. Not affected by time; ageless. Done at an improper time; unseasonable; untimely. noun A gene encoding an essential protein that regulates circadian rhythm, normally written in italics: timeless. Related Words: unchangedunaltereddatelessimmortalundyingeverlastingeternalperpetualunendingendlessperennialever-present Back to today's word