The word 'unoiled' is a straightforward English formation built upon the core noun 'oil,' which traces back to Latin oleum for "olive oil." The Germanic negative prefix 'un-' is attached to negate the state, and the adjectival suffix '-ed' is added to indicate the condition of being without oil. Thus, the literal construction "not in the state of having oil" directly yields the modern meanings, describing either a mechanical part lacking lubrication or a substance not treated with oil.

Structure: un (not) + oil (greasy liquid) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English un-), meaning "not." It functions as a negative particle. - oil: A noun of Latin origin (oleum, "olive oil"), via Old French oile. In this compound, it functions as the core semantic root. - ed: A suffix of Germanic origin (Old English -ed, -od), used to form adjectives from nouns or verbs, indicating a state or condition.