I'm having a hard time because my kid's stubborn.
Stubborn Kristen insisted that Koichi and Viet would stay friends till the end.
Fugu is stubborn to the core and is set in his ways.
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.