fortitude and determination
gumption - guts
If somebody has ‘gumption’ they are capable of working out what needs to be done in a particular situation and have the courage to do it. It is an informal word that is always used in a positive sense as it implies initiative, common sense, determination, and bravery.
I know Robert isn’t the most qualified job candidate, but I’m giving him the position because I like his gumption.
I’m putting Anna in charge of the marketing campaign. Only she has the gumption to pull it off.
The entrepreneur has a reputation for efficiency, and she was every bit as gumptious as I had heard.