Obdurate
adj.
1. stubborn; unyielding
2. hardened against good influence; impenitent
Synonyms
relentless
tough
unbending
Antonyms
submissive
susceptible
yielding
Sentences
The man's obdurate behavior caused him to loose his job after refusing to do a task he though was below him.
The young child's obdurate demeanor made it hard to make friends because he would never play their games.
Stubborn people