1.
Someone who is ~ or who behaves in a ~ way is determined to do what they want and is very unwilling to change their mind.
He is a ~ character used to getting his own way...
= obstinate
ADJ
~ly
He ~ly refused to tell her how he had come to be in such a state.
ADV
~ness
I couldn’t tell if his refusal to talk was simple ~ness.
N-UNCOUNT
2.
A ~ stain or problem is difficult to remove or to deal with.
This treatment removes the most ~ stains...
= persistent
ADJ: usu ADJ n
~ly
Some interest rates have remained ~ly high.
ADV