He's young, very headstrong, but he's a good man underneath.

他年轻、任性，但骨子里是个好人。

《柯林斯英汉双解大词典》

He's a very headstrong and mulish person most of the time, but underneath I think he's quite vulnerable.

他大多数时候是个非常倔强和刚愎自用的人，但我想他骨子里是很脆弱的。

youdao

Brett was very precocious, headstrong, and smart, butbecause of his developmental immaturity, he was one incident away from beingasked to leave preschool.

布雷特很早熟，任性，聪明。 但是由于心智尚浅，随时都可能因为再次犯错被幼儿园退学。

youdao

The saga continued last year with New Moon,and now in Eclipse, headstrong high school student Bella Swan affirms her love for classmate Edward Cullen, a soulful and very pale teenager.

VOA: standard.2010.07.07

Mr Unwin described his wife as "very, very independent" and "headstrong".

BBC: Ona Mary Unwin