[bù dàng]
unsuitable; improper; inappropriate
unfair verdict
不當裁決
illegal profit; ill-gotten gains
不當得利
improper arrest; unjust arrest
不當逮捕
unwarranted intervention
不當干涉
unjust judgement
不當判決
improper act; undue behaviour
不當行為
undue delay
不當延誤
not be handled properly
處理不當
wrong choice of words
措詞不當
They were shocked by the impropriety of the young man's action.
他們為那年輕人的不當舉止而感到震驚。