The word 'untarnished' is a relatively modern English formation, built upon the verb 'tarnish,' which entered the language in the late 16th century. 'Tarnish' itself derives from the Old French ternir, meaning "to make dull or dark," a term likely influenced by Germanic roots related to dimness or concealment. By adding the native English negative prefix 'un-' and the participial suffix '-ed,' the word constructs a literal meaning of "not having been made dull." This morphemic logic perfectly maps to its modern abstract sense, describing something—often a reputation, metal, or ideal—that remains bright, pure, and free from any stain or corrupting influence.

Structure: un (not) + tarnish (to dull or stain) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English) meaning "not," used to form negatives. - tarnish: A verb of French origin (from Old French ternir, "to make dull"), likely from a Germanic source. - ed: A suffix of Germanic origin (Old English) used to form adjectives from verbs, indicating a state or condition.