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pos‧si‧bly S1 W2

1 used when saying that something may be true or likely, although you are not completely certain [= perhaps, maybe]:
This last task is possibly the most difficult.
It will take three weeks, possibly longer.
'Will you be here tomorrow?' 'Possibly.'
This last task is possibly the most difficult.
It will take three weeks, possibly longer.
'Will you be here tomorrow?' 'Possibly.'2 spoken used to emphasize that you are very surprised or shocked by something, or you cannot understand it :
3 used when making a polite request :
Could you possibly close that window?
could/can you possibly
spoken
Could you possibly close that window?4 used to emphasize that someone will do or has done everything they can to help or to achieve something :
5 used to emphasize that you cannot do something, or that something cannot or could not happen or be done
can't/couldn't possibly
I can't possibly allow you to go home in this weather.
She couldn't possibly have heard what was said.
I can't possibly allow you to go home in this weather.
She couldn't possibly have heard what was said.