What part of speech is patient when it used to mean able put up with things that are annoying without complaining?

Here's why:

* It modifies a noun: It describes a quality of a person, such as their ability to endure annoyance without complaint.

* It doesn't act as a verb: It's not performing an action.

* It doesn't function as a noun: It's not a person, place, or thing.

For example: "She was a patient woman, never letting small inconveniences get to her." Here, "patient" modifies the noun "woman."