Refractory
Part of speech: adjective
Definition: Obstinate and unruly; strongly opposed to something. Not affected by great heat. Difficult to treat. Incapable of registering a reaction or stimulus.
Part of speech: noun
Definition: A material or piece of material, such as a brick, that has a very high melting point.
Stubborn
Part of speech: adjective
Definition: refusing to move or change one's opinion; obstinate.
Example sentence: O, you men who think or say that I am malevolent, stubborn or misanthropic, how greatly do you wrong me. You do not know the secret cause which makes me seem that way to you, and I would have ended my life - it was only my art that held me back. Ah, it seemed impossible to leave the world until I had brought forth all that I felt was within me.