The word 'unarmored' is a modern English formation built upon the noun 'armor.' 'Armor' itself has a martial lineage, tracing back to the Latin verb armare, meaning "to equip or fit out," which is derived from arma, meaning "tools, weapons." The Germanic negative prefix un-, one of the oldest and most stable in the language, is attached to negate the core concept. The adjectival suffix -ed is then added, following a common English pattern (e.g., 'talented,' 'walled') to mean "possessing the qualities of." Thus, the literal construction "not provided with armor" logically yields the modern meanings of lacking physical protection or being in a vulnerable state.

Structure: un (not) + armor (protective covering) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English un-), meaning "not." It functions as a negative particle. - armor: A noun of Latin origin (via Old French armure), from Latin armatura ("equipment, armor"), from armare ("to arm"). It functions as the core root denoting protective covering. - ed: A suffix of Germanic origin (Old English -ed, -od), used to form adjectives from nouns, meaning "having, provided with, characterized by."