undaunted (adj.)youdaoicibaDictYouDict[undaunted 词源字典]
mid-15c., with reference to horses, "untamed, not broken in," from un- (1) "not" + past participle of daunt (v.). In reference to persons, "intrepid," it is recorded from 1580s.[undaunted etymology, undaunted origin, 英语词源]