不厭其煩

Simplified: 不厌其烦

bùyànqífán ㄅㄨˋ ㄧㄢˋ ㄑㄧˊ ㄈㄢˊ

    • not to mind taking all the trouble (idiom)
    • to take great pains
    • to be very patient

Character by character

Sources