obstinacy

noun, plural ob·sti·na·cies for 5.

1. the quality or state of being obstinate; stubbornness.
2. unyielding or stubborn adherence to one’s purpose, opinion, etc.
3. stubborn persistence: The garrison fought on with incredible obstinacy.
4. resistance to cure, relief, or treatment, as a disease.
5. an instance of being obstinate; an obstinate act, viewpoint, etc.

noun plural -cies

1. the state or quality of being obstinate
2. an obstinate act, attitude, etc

n.late 14c., from Medieval Latin obstinatia, from obstinatus (see obstinate).