unvarnished (adj.)youdaoicibaDictYouDict[unvarnished 词源字典]
c. 1600, of statements, "not embellished," from un- (1) "not" + past participle of varnish (v.). Literal sense of "not covered in varnish" is recorded from 1758.[unvarnished etymology, unvarnished origin, 英语词源]