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plainness (n.)
[plainness 词源字典]
c. 1300, "flatness," from
plain
(adj.) +
-ness
. Meaning "clarity" is mid-15c.; that of "open conduct" is from 1540s; that of "absence of ornament" is from 1580s.
[plainness etymology, plainness origin, 英语词源]
[plainness 词源字典]