pertinacious
Meaning: stubbornly persistent
Usage: Harry’s parents were frustrated with his pertinacious insistence that a monster lived in his closet. Then they opened the closet door and were eaten.
obstinate
Meaning: not yielding easily, stubborn
Usage: The obstinate child refused to leave the store until his mother bought him a candy bar.
restive
Meaning: resistant, stubborn, impatient
Usage: The restive audience pelted the band with mud and yelled nasty comments.
inveterate
Meaning: stubbornly established by habit
Usage: I’m the first to admit that I’m an inveterate coffee drinker—I drink four cups a day.
resolute
Meaning: firm, determined
Usage: With a resolute glint in her eye, Catherine announced that she was set on going to college in New York City even though she was a little frightened of tall buildings.