I have a hard head.

我的头很硬。

youdao

I am touchy and have a hard head, all the defects of the Calabrians and I have fiery nature.

我很暴躁，有点顽固，身上有许多卡拉布里亚人的缺点，我本性就很暴躁。

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》

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

"He then pinned me against a three foot wall and punched me repeatedly in the head as hard as he could, without a second for me to defend myself, " she said.

BBC: Attacked girlfriend says boyfriend should be in jail

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