摇摆不定

tā yǐ yǒu lì de lùn jù shuō fú le nà xiē yáo bǎi bù dìng de rén

他以有力的论据说服了那些摇摆不定的人。

The strength of his argument convinced the waverers.

chuán shēn yáo bǎi bù dìng ràng wǒ jué de ě xin

船身摇摆不定，让我觉得恶心。

The swaying motion of the ship was making me feel seasick.