crackbrained /ˈkrækˈbreɪnd/ adjective Learner's definition of CRACKBRAINED
[more crackbrained; most crackbrained] informal
: very silly or foolish愚蠢的;癫狂的 -
a crackbrained artist癫狂的艺术家
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They've devised some crackbrained [=harebrained, crazy] scheme.他们制订了一个疯狂的计划。