Possibly I Happen Adverb ˈpɒsəbli ˈpɑːsəbli Worst Performance

• 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.’
• ‘i’m sure he didn’t mean to be rude.’ ‘quite possibly (= you may be right), but the damage has been done.’

possibly

1. used to say that something might exist, happen or be true, but you are not certain
• SYNONYM perhaps
  https://www.oxfordlearnersdictionaries.com/definition/english/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.’
• ‘I’m sure he didn’t mean to be rude.’ ‘Quite possibly (= you may be right), but the damage has been done.’
• Last year, his mother died, possibly due to heart failure.
• a popular but possibly dangerous type of extreme diet
2. used with can/could to emphasize that you are surprised, annoyed, etc. about something
• You can't possibly mean that!
• How could you possibly think that I had anything to do with it!
• He turned out to be the nicest guy you could possibly imagine.
• What could possibly go wrong?
3. used with could to ask somebody politely to do something
• Could you possibly open that window?
4. used with can/could to say that somebody will do or has done as much as they can in order to make something happen
• I will come as soon as I possibly can.
• They tried everything they possibly could to improve the situation.
• We don’t want these rumours to spread if we can possibly avoid it.
• I don't see what more he could possibly do.
5. used with negatives, especially can't/couldn't, to say strongly that you cannot do something or that something 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).’