Senses
不了 unable to
Used after a verb to indicate that an action or result is impossible
不了 to not finish
(Literary) To be left unfinished or to remain unresolved.
不了 incessantly
Used after a verb and the word 个 to describe an action that is endless or happens without stopping
不了 no thanks
Used to politely but informally decline an offer or suggestion, meaning "no more" or "I am finished".
不了 to not understand
(Literary) To not understand or to be unclear about something.