unalloyed

　Given how much is at stake, it is reasonable to expect Theresa May to sound confident that Brexit is the best available path for the country, but she cannot. She says instead that it is the only path, of which the best must be made. In an interview last week, she declined to say it would be “worth it”. She has never repudiated her vote for remain and refuses to say how she would vote in a hypothetical rerun. …
　If so, we are deep in a devotional phase. Corbyn’s opinion on the divine is unrecorded, but the religious aspect to his support base is unmistakable. Not all Labour supporters fit the profile of the truest believers, but there is a phenomenal capacity among the hardcore for projecting absolute virtue on to the leader and unalloyed wickedness on to his detractors. (Skip the rest)

https://www.google.co.jp/amp/s/amp.theguardian.com/commentisfree/2018/apr/03/i-see-no-sign-that-this-politics-of-devotion-is-doing-us-any-goo

　今回取り上げる語は、unalloyed /ʌnəlˈɔɪd/ です。この語は un- + alloy + -ed と構成されており、alloy は「合金」という意味を持ちます。”unalloyed wickedness” と使われてることから unalloyed は形容詞であることが推測できました。では、今回の文脈でどのような意味を持つのか、以下で確認していきます。
　まず意味を LDOCE でみると、“complete, pure, or total” とあり、Cambridge Dictionary には “(especially of a positive feeling) not spoiled by any amount of negative feeling; pure” と定義されていました。
　次に語源を Online Etymology Dictionary でみると、“1670s (figurative); 1760s (literal), from un- (1) "not" + past participle of alloy (v.).” とありました。
　以上のことから、unalloyed は合金のように複数のものが混ざり合ってないことを表して「純粋な」という意味になることがわかりました。(OkaUchi)