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ingratitude (n.)
[ingratitude 词源字典]
mid-14c., from Old French
ingratitude
(13c.) and directly from Latin
ingratitudinem
(nominative
ingratitudo
), noun of quality from
ingratus
(see
ingrate
).
[ingratitude etymology, ingratitude origin, 英语词源]
[ingratitude 词源字典]