Stubborn
noun, な adjective
A hard stubborn person is very stubborn no matter how you look at them. Try to break through that hard stubbornness and all you'll find is more stubborn.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
頑固な人
stubborn person
頑固なよごれ
stubborn stain
頑固な性格
stubborn personality
アイツ、めっちゃ頑固だよ。
He is really stubborn.
これを使うと、頑固なシミもすぐ落ちるんだって。
I heard that this can remove stubborn stains quickly.
おじいちゃんって頑固者だよね。
Grandpa is stubborn, huh?