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obduration (n.)
[obduration 词源字典]
c. 1400, "hard-heartedness," from Latin
obdurationem
(nominative
obduratio
), noun of state from past participle stem of
obdurare
(see
obdurate
).
[obduration etymology, obduration origin, 英语词源]
[obduration 词源字典]