Apedia

无 Ineffectual `Ini'fektjuəl A.无效的,徒劳无益的 Adj Early 15c Opposite

单词 ineffectual
音标 [`ini'fektjuəl]
解释 a.无效的,徒劳无益的
红宝书
字源 ineffectual (adj.)
early 15c., from in- (1) "not, opposite of" + effectual. Related: Ineffectually; ineffectuality.
不择手段背单词
趣味全助记

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