witless
[ˈwɪtlɪs]
adj.
（好像）缺乏思维能力的，无才智的，愚蠢的;
例句:
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The assassination attempt that failed in July 1944 was witless and traitorous.
1944年7月以失败而告终的那个暗杀企图即无头脑,又失信义.
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One day, this witless gentleman got a rather strange idea.
有一天, 这位有勇无谋的绅士产生了一个非常古怪的念头.
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A pestilence on the witless little dunce!
该死的蠢丫头!
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What's with all the pointless, witless filler?
来自SA
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It drives me witless to have to agree with Mrs Betts, but I do.
来自J. Trollope
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Henry's book turns out wonderfully, but this redounds entirely to the witless actor's credit.
来自WSJ