unalloyed
/ˌʌnəˈlɔɪd/adjective
1- (of metal) not alloyed; pure（金属）非合金的; 纯的：
unalloyed copper.
纯铜。
1.1
- (chiefly of emotions) complete and unreserved（主要指情感） 纯粹的; 十足的：
unalloyed delight.
真正的快乐。