obstinate

verbs

persist stubbornly
"he obstinates himself against all rational arguments"
obstinate
is derived from
obstinance
is a type of (narrower)
be persistent, refuse to stop
"he persisted to call me every night"; "The child persisted and kept asking questions"
hang in, hang on, hold on, persevere, persist

adjectives

tenaciously unwilling or marked by tenacious unwillingness to yield
obstinate, stubborn, unregenerate
stubbornly persistent in wrongdoing
cussed, obdurate, obstinate, unrepentant
resistant to guidance or discipline
"Mary Mary quite contrary"; "an obstinate child with a violent temper"; "a perverse mood"; "wayward behavior"
contrary, obstinate, perverse, wayward