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insincere (adj.)
[insincere 词源字典]
1620s (implied in
insincerely
), from Latin
insincerus
"not genuine, not pure, adulterated," from
in-
"not" (see
in-
(1)) +
sincerus
(see
sincere
).
[insincere etymology, insincere origin, 英语词源]
[insincere 词源字典]