The word 'unstretched' is a modern English formation built upon the Germanic verb 'stretch'. The core verb 'stretch' originates from the Old English streccan, meaning "to spread out, extend," which is related to the Proto-Germanic strakjaną, "to stretch." The prefix 'un-', a prolific negator in English from its Old English roots, is attached to create the opposite meaning. Finally, the adjectival suffix '-ed' is added, signaling the resulting state. Thus, the literal morpheme sequence "not + extended + (state)" logically yields the modern meaning describing something that has not been pulled taut or lengthened, remaining in its original, relaxed dimension.

Structure: un (not) + stretch (to extend) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English un-), meaning "not," used to form negatives. - stretch: A verb of Germanic origin (from Old English streccan), meaning to extend or draw out to full length. - ed: A suffix of Germanic origin (Old English -ed, -od, -ad), used to form adjectives from verbs, indicating a state or condition.