ungracious (adj.)youdaoicibaDictYouDict[ungracious 词源字典]
c. 1200, "ungrateful;" early 14c., "lacking God's grace;" early 15c., "rude, unmannerly," from un- (1) "not" + gracious (adj.). Related: Ungraciously.[ungracious etymology, ungracious origin, 英语词源]