General Stubbornness:
* Matigas ang ulo (literally: "hard-headed") - This is the most common and direct translation for stubborn.
* Mapagsungit (literally: "easily angered" or "grouchy") - This implies someone who is stubborn and easily frustrated.
* Mapilit (literally: "insistent") - This refers to someone who is stubborn and insistent on having their own way.
Specific Stubbornness:
* Masungit (literally: "grouchy") - This refers to someone who is stubbornly unwilling to cooperate or be agreeable.
* Suplado (literally: "snobbish") - This refers to someone who is stubbornly arrogant and dismissive of others.
The best word to use depends on the specific nuance you want to convey.