The word 'unbelted' is a modern English formation built upon the core noun 'belt,' which traces back to Old English belt, itself borrowed from Latin balteus meaning "girdle, sword belt." The Latin term's deeper origins are uncertain. The prefix 'un-,' a prolific and ancient Germanic negation marker, combines with 'belt' to create the sense of "not belted." The adjectival suffix '-ed' is then added, following a common pattern for forming descriptive adjectives from nouns (e.g., 'talented,' 'winged'). Thus, the literal morpheme sequence "not + belt + having" logically constructs the modern meanings describing the state of not being restrained or secured by a belt.

Structure: un (not) + belt (a strip of material) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English un-), meaning "not." It functions as a negative particle. - belt: A noun of Germanic origin (Old English belt), referring to a strip of material. In this compound, it functions as the core semantic root. - ed: A suffix of Germanic origin (Old English -ed, -od), originally forming past participles of verbs, now commonly used to create adjectives meaning "having the characteristics of" or "being in a state of."