Stout-hearted, firm, or courageous; emotionally steady and unshakable (often used as '気丈な').
悲しい知らせを聞いても、彼女は気丈に振る舞った。
Even after hearing the sad news, she behaved bravely and composed.
気丈な態度で周囲を安心させた。
Her resolute demeanor reassured those around her.
年配の方が気丈さを見せてくれたので、皆が励まされた。
The elderly person showed fortitude, which encouraged everyone.