expression, godan verb (-u)
say selfish things; act spoiled; whine
Used when someone, often a child or someone acting childishly, insists on their own way unreasonably. Can be used for adults behaving in a demanding or self-centered manner.
子供がわがままを言って泣き出した。
The child started crying after saying something selfish.
彼はいつもわがままを言って
He always says selfish things and troubles those around him.