steely-eyed

Adjective

Meaning

(idiomatic) Having a hard, strong, and determined look about oneself.

(idiomatic) Having a hard, strong, and determined mentality or mindset.

Source: en.wiktionary.org

Synonyms

diehard hardcore steely-nerved steely-spined tough as nails

Close letter words and terms

steely steely hair disease steely iron steely-eyed missile man steely-grey steely-nerved