I have a hard head.

我的头很硬。

youdao

With a toss of his head and a few hard gulps, Bob finished the last of his beer.

鲍勃仰头咕咚咕咚几大口喝完了剩下的啤酒。

《柯林斯英汉双解大词典》

He went on to suffer a couple of hard hits to the head, which sent him to the hospital again.

他的头部受到了几次重击，再次被送往医院。

youdao

A company that can keep its head above water can survive economic hard times.

VOA: special.2009.05.10

Prosecutors charged Woodward with first-degree murder, accusing her of shaking Matthew and slamming his head against a hard surface.

CNN: Cross-examination of nanny called 'minefield' for prosecution

In a hard-hitting speech, the head of the OFT said that banks had been dragging their feet over improving their service on matters such as making it easier to switch bank accounts.

BBC: OFT warns banks to change or face competition probe

Pelley is everything Couric was not: an internal hire, relatively cheap (probably), cast from the traditional anchor mold (read: a white guy with a nice head of hair), with a background primarily in hard news.

FORBES: CBS Plays It Safe with New 'Evening News' Anchor Scott Pelley