The word 'unselected' is a modern English formation built upon the core verb 'select,' which entered English from Latin via French. The Latin source 'seligere' combined 'se-' (apart) and 'legere' (to gather, choose), conveying the act of picking something out from a group. The Germanic negative prefix 'un-' was later attached to negate this action, and the adjectival suffix '-ed' was added to describe the resulting state. Thus, the literal construction "not having been chosen apart" logically evolved into its current abstract meaning of not being chosen or picked.

Structure: un (not) + select (choose) + ed (adjective suffix) un: A prefix of Germanic origin (Old English 'un-'), meaning "not," used to form negatives. select: A verb from Latin 'seligere' (se- 'apart' + legere 'to choose'), meaning "to choose." ed: A suffix of Germanic origin (Old English '-ed', '-od'), used to form adjectives from verbs, indicating a state or condition.