不厌其烦 (bú yàn qí fán): Be patient and persistent — Meaning & Stroke Order

The teacher is always patient and persistent in answering every single question from the students.

Aren't you tired of explaining the same issue to him over and over again?

My mother tirelessly helped me review my lessons.

He is not exactly patient and tireless; he persists in guiding only out of a sense of responsibility.