The word 'timelessly' is built upon the Old English noun 'tīma', which originally denoted a measurable period or a fitting season. The addition of the adjective-forming suffix '-less', meaning "without," creates 'timeless', an adjective describing something that exists as if devoid of temporal limits. Finally, the adverbial suffix '-ly' is appended, converting the adjective into an adverb that describes the manner of an action. Thus, the literal construction "in a manner without time" elegantly captures the modern abstract sense of eternal relevance or permanence, unaffected by changing eras.

Structure: time + less + ly - time: From Old English 'tīma' (a period, season, era), of Germanic origin. Functions as the core noun root. - less: From Old English '-lēas' (devoid of, free from), a suffix forming adjectives meaning "without." - ly: From Old English '-līce', an adverbial suffix forming adverbs from adjectives.