1
be half-witted
作表语，描述主语的特征。
The plan was half-witted from the start.
这个计划从一开始就很愚笨。
智力有缺陷的；愚笨的
先理解核心含义，再看它在真实句子里的用法。
智力有缺陷的；愚笨的
retarded in intellectual development
The plan was half-witted from the start.
这个计划从一开始就很愚笨。
智力低下的
Having low intelligence.
智力发展迟缓
retarded in intellectual development
He made a half-witted mistake by leaving his keys in the locked car.
他把钥匙锁在车里，犯了一个愚蠢的错误。
The movie's half-witted plot made it hard to enjoy.
这部电影的愚蠢情节让人难以欣赏。
Don't be half-witted; you should check the map before driving.
别犯傻了，开车前应该先查地图。
作表语，描述主语的特征。
The plan was half-witted from the start.
这个计划从一开始就很愚笨。
作定语修饰名词。
He made a half-witted comment during the meeting.
他在会议上发表了愚蠢的评论。
与系动词连用，表示看起来愚蠢。
The proposal seemed half-witted to everyone.
这个提议在大家看来都很愚笨。
Not this
He is a half-witted.
Use this
He is half-witted.
half-witted 是形容词，前面不能加冠词 a，应直接作表语。
Not this
He is half witted.
Use this
He is half-witted.
复合形容词 half-witted 需要连字符连接，否则会被视为两个独立的词，不符合英语规范。
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Dictionary facts from ECDICT, WIKTIONARY.