The word 'unending' is a transparent English formation built from native Germanic elements. The core concept originates from the Old English verb endian, meaning "to bring to a conclusion," which itself traces back to the Proto-Germanic andijōną. The negative prefix 'un-', one of the most common in the language, is prepended to reverse the meaning, creating the sense of "not finishing." Finally, the participial suffix '-ing' transforms the verbal idea into an adjectival state, describing something that is perpetually in the condition of not reaching its end. Thus, the literal construction "not-ending" perfectly captures the modern abstract sense of being limitless, perpetual, or everlasting.

Structure: un (not) + end (to stop) + ing (adjective suffix) - un: A prefix of Germanic origin (Old English), meaning "not," used to form negatives. - end: A root of Germanic origin (Old English endian), meaning "to stop, to finish." - ing: A suffix of Germanic origin (Old English -ende, -ung), here forming a present participle used as an adjective.