backbone — Your backbone is the column of small linked bones down the middle of your back.
braveness — possessing or exhibiting courage or courageous endurance.
bravery — Bravery is brave behaviour or the quality of being brave.
bravura — If you say that someone is doing something with bravura, you mean that they are using unnecessary extra actions that emphasize their skill or importance.
courageousness — possessing or characterized by courage; brave: a courageous speech against the dictator.
daring — People who are daring are willing to do or say things which are new or which might shock or anger other people.
dash — If you dash somewhere, you run or go there quickly and suddenly.
dauntlessness — The characteristic of being dauntless; fearlessness.
determination — Determination is the quality that you show when you have decided to do something and you will not let anything stop you.
endurance — The fact or power of enduring an unpleasant or difficult process or situation without giving way.
enterprise — A project or undertaking, typically one that is difficult or requires effort.
fearlessness — without fear; bold or brave; intrepid.
firmness — not soft or yielding when pressed; comparatively solid, hard, stiff, or rigid: firm ground; firm texture.
fortitude — mental and emotional strength in facing difficulty, adversity, danger, or temptation courageously: Never once did her fortitude waver during that long illness.
