un·al·loyed /ˌʌnəˈlɔɪd/
(a.)未攙雜的,純粹的,真正的,非合金的
Un·al·loyed a. Not alloyed; not reduced by foreign admixture; unmixed; unqualified; pure; as, unalloyed metals; unalloyed happiness.
I enjoyed unalloyed satisfaction in his company. --Mitford.
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unalloyed
adj : used of metals