unalloyed
adjective literary uk/ˌʌn.əˈlɔɪd/ us/ˌʌn.əˈlɔɪd/
（尤指积极的情感）纯真的，纯粹的
(especially of a positive feeling) not spoiled by any amount of negative feeling; pure
Spending time with one's family is never an unalloyed pleasure (= there are bad things about it too). 和家人在一起时从来不会只有快乐、没有烦恼。
We had the perfect holiday - two weeks of unalloyed bliss. 我们度过了完美的假期——两周逍遥快活的时光。