He has no doubts about his manliness.

他毫不怀疑他的男子气概。

《柯林斯英汉双解大词典》

It was also true that I wanted to show off my new manliness.

我想表现出全新的男子汉气概，这也是真的。

youdao

I think some men fear their feminine side, as if being nurturing would take away from their manliness somehow.

我想，有些男人害怕显露他们女性的一面，好像养育子女多少会夺走他们男子汉的气概似的。

youdao

Academic achievement would play second fiddle to the character and manliness thought to be inculcated by prestigious boarding schools.

ECONOMIST: Ivy League universities

But he never evolves into more than a constipated rich guy who communicates in pained glances, curt demands, and other signifiers of manliness.

NEWYORKER: Horsey Set

Self-reliance is high on the list of traits generally associated with manliness according to the Male Role Norms Inventory, the most commonly used measure of masculinity.

FORBES: Why Do Men Die Earlier? (Hint: It's Not The Ladies' Fault)