contradictory (adj.)youdaoicibaDictYouDict[contradictory 词源字典]
1530s, "mutually opposed, at variance," from Late Latin contradictorius "containing a contradiction or objection," from contradictus, past participle of contradicere (see contradiction). Meaning "fond of contradicting" is from 1891. Used earlier as a noun (late 14c.).[contradictory etymology, contradictory origin, 英语词源]