Senses
不知 not to know
to not know; to be unaware of or have no idea about
不知 unknowingly
without realizing; unconsciously; in a way that one is not aware of
不知 wonder if
Used to politely introduce a question, meaning "I wonder if..." or "I don't know if...".
不知 not to admit
to not admit or give in to something (such as defeat, hardship, or tiredness)
不知 ignorance
the state of being ignorant or unaware