vacillation [ˌvæsə'leɪʃn]

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n.动摇；忧柔寡断

indecision in speech or action

Vacillation is the cause of his failure. 优柔寡断是他失败的原因。
His constant vacillation made him an unfit administrator. 他经常优柔寡断，这使他不适合当行政官员。