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inefficacious (adj.)
[inefficacious 词源字典]
1650s, from
in-
(1) "not, opposite of" +
efficacious
. Related:
Inefficaciously
;
inefficaciousness
(1640s).
[inefficacious etymology, inefficacious origin, 英语词源]
[inefficacious 词源字典]