ineptitude [ɪˈneptɪtju:d]

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n.不适当；愚笨，愚昧的言行

unskillfulness resulting from a lack of training

History testifies to the ineptitude of coalitions in waging war. 历史昭示我们，多数国家联合作战，其进行甚为困难。
They joked about his ineptitude. 他们取笑他的笨拙。