Answer:
serious, determined, stubborn
Explanation:
Just got it right on edg 2020
Are you working on the reference list? What style are you writing? As the variant, you can go to the professional writing service online Prime Writings. No intention to promote it or so. You may just check what they can do for you.
Shakespeare is the guy you're thinking of. I'm not sarcastic just needed to add extra stuff to fill the 20 characters minimum