Persistence

adjective describing a person who is determined and resolute in their opinions and beliefs

• She is known for being a strong minded individual who always stands by her principles.
• My sister is so strong minded, she never lets anyone tell her what to do.
• Don't mess with him, he's one of the most strong minded guys I know.
• Her strong minded attitude is like a shield, protecting her from negativity.

noun constant or close attention to what one is doing; diligence

• His assiduousness in completing all tasks assigned to him is truly commendable.
• She showed great assiduousness in studying for her exams.
• Dude, your assiduousness in cleaning your room is on point.
• The artist's assiduousness in perfecting every brushstroke is reflected in the masterpiece he created.