/ ˈpɒsəbli; NAmE ˈpɑːs-/ adverb
1.
used to say that sth might exist, happen or be true, but you are not certain
SYN perhaps :
It was possibly their worst performance ever.
She found it difficult to get on with her, possibly because of the difference in their ages.
'Will you be around next week?' 'Possibly.'
2.
used to emphasize that you are surprised, annoyed, etc. about sth :
You can't possibly mean that!
3.
used to ask sb politely to do sth :
Could you possibly open that window?
4.
used to say that sb will do or has done as much as they can in order to make sth happen :
I will come as soon as I possibly can.
They tried everything they possibly could to improve the situation.
5.
used with negatives, especially 'can't' and 'couldn't', to say strongly that you cannot do sth or that sth cannot or could not happen or be done :
I can't possibly tell you that!
You can't possibly carry all those bags.
'Let me buy it for you.' 'That's very kind of you, but I couldn't possibly (= accept) .'