To be unreasonable or whine; to throw a tantrum, often to try to get one's way.
2歳の息子がスーパーでおもちゃを買ってほしくて駄々をこねた。
My two-year-old son threw a tantrum in the supermarket because he wanted a toy.
大人になっても駄々をこねるような態度は信頼を失いやすい。
Even as an adult, acting like you throw tantrums can easily make people lose trust in you.
頼んだ仕事をやらないのに、言い訳ばかりして駄々をこねるのは困る。
It's troublesome when someone refuses to do the work they were asked to do and just makes excuses and whines.
母親は息子の駄々をこねる態度に根気強く向き合った。
The mother patiently dealt with her son's tantrums.