姐很任性英语怎么说

“姐很任性”可以翻译成英文的 "My sister is very stubborn" 或 "My sister is very headstrong."
"Stubborn" 指的是固执己见，不愿改变想法，例如：
He was too stubborn to admit that he was wrong. 他太固执了，不愿承认自己是错的。
"Headstrong" 指的是倔强，有时也可以形容一个人固执己见或不听劝告，例如：
She was headstrong and refused to listen to anyone's advice. 她很倔强，不愿听任何人的劝告。
注意，"headstrong" 和 "stubborn" 在某些情况下可能带有负面的意味，因此可能不是最好的词来形容一个人。