the word "unpopular" is a straightforward english formation, combining the native english negative prefix "un-" with the adjective "popular," which entered english from latin via french. the latin root 'populus' referred to a body of people, a nation, or a multitude. "popular" thus originally described something pertaining to or favored by the common people. by adding the negating prefix, "unpopular" logically constructs the meaning of not being favored by the people or the general public. this transparent morphological process demonstrates how english readily creates antonyms by prefixation, with the core concept of public favor or common appeal remaining central from its latin origins to its modern usage.

Structure: un (not) + popular (liked by many) - un: a prefix of germanic origin (old english) meaning "not," used to give a negative or opposite force to adjectives and their derivatives. - popular: from latin 'popularis' (belonging to the people, common), from 'populus' (the people). in english, it functions as an adjective meaning "liked, admired, or enjoyed by many people."