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half-hearted (adj.)
[half-hearted 词源字典]
also
halfhearted
, "showing little enthusiasm," early 15c.; see
half
+
hearted
. Related:
halfheartedly
;
halfheartedness
. English in 17c. also had
half-headed
"stupid."
[half-hearted etymology, half-hearted origin, 英语词源]