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unrefined (adj.)
[unrefined 词源字典]
1590s, "not refined in manners," from
un-
(1) "not" + past participle of
refine
(v.). Meaning "not free from gross matter" is recorded from 1610s.
[unrefined etymology, unrefined origin, 英语词源]
[unrefined 词源字典]