en_tn/pro/21/29.md

makes his face hard

Possible meanings are 1) "pretends to be courageous" or 2) "will not listen to correction." (See: rc://en/ta/man/translate/figs-idiom)

is certain about his ways

A person's actions are spoken of as if they were a path upon which the person walks. Alternate translation: "is certain about what he does" or "is confident about what he does" (See: rc://en/ta/man/translate/figs-metaphor)