the word 'undeterred' is a modern english formation built upon the verb 'deter', which entered english in the 16th century from latin deterrere, meaning "to frighten away". deterrere itself is composed of de- ("away") and terrere ("to frighten"). the anglo-saxon negative prefix un- and the participial suffix -ed were later attached, following a common english pattern for creating adjectives that describe a state of not having been affected by an action. thus, the literal construction "not frightened away" evolved into the contemporary abstract sense of remaining persistent and not discouraged by obstacles.

Structure: un (not) + deter (discourage) + ed (adjective suffix) - un: a prefix of germanic origin, meaning "not" or "opposite of". it functions as a negator. - deter: from latin deterrere, meaning "to frighten from, discourage". it functions as the core verb root. - ed: a suffix of old english origin, used to form adjectives from verbs, indicating a state or condition.