Etymology
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undeterred (adj.)

c. 1600, from un- (1) "not" + past participle of deter (v.).

updated on February 26, 2014

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Definitions of undeterred from WordNet

undeterred (adj.)
not deterred; "pursued his own path...undeterred by lack of popular appreciation and understanding"- Osbert Sitwell;
Synonyms: undiscouraged
From wordnet.princeton.edu, not affiliated with etymonline.