unrestrained (adj.)youdaoicibaDictYouDict
1580s, from un- (1) "not" + past participle of restrain (v.). Related: Unrestrainedly.
wanton (v.)youdaoicibaDictYouDict
"to revel, frolic unrestrainedly," 1580s, from wanton (adj.). Related: Wantoned; wantoning.