Synonyms for Unmixed (same or very similar meaning)
WordNet sense 1 (not mixed with extraneous elements):
plain, sheer, unmingledWordNet sense 2 (free of extraneous elements of any kind):
pureWordNet sense 3 (not constituting a compound):
uncompoundedWordNet sense 4 (not joined or united into one):
uncombinedFrom the ODE community, based on WordNetadd/edit