possible + -ly

source: ［Dragon Ball Super : Broly］ Ce qu'on sait déjà du film et pourquoi il effraie les fans | Journal du Geek

可能性を表す副詞

definitely (確実に)

no doubt, doubtless (間違いなく)

almost certainly (ほぼ間違いなく)

presumably (どうやら)

probably (たぶん, 十中八九)

hopefully (うまくいけば)

perhaps, maybe (ひょっとすると)

possibly (ことによると)

1. sentence adverb perhaps (used to indicate doubt or hesitancy):

〖文修飾〗ことによると, (確信はないが)もしかすると

e.g. he found himself alone, possibly the only surviving officer.

with modal used in polite requests:

｟話｠ 〖can, couldを伴った疑問文で〗何とか, ひょっとして (!控えめな依頼を表す)

e.g. could you possibly pour me another cup of coffee?

2. usually with modal in accordance with what is likely or achievable.

used to emphasize that something is difficult, surprising, or bewildering:

｟主に話｠ 〖can, couldを伴った疑問文･否定文で〗とても［どうしても］(…できない［…のはずはない］); いったいどうして(…できるのか［…でありえるのか］)

e.g. what can you possibly mean?

used to emphasize that someone has or will put all their effort into something:

〖can, couldを伴って〗何とかして, できる限り

e.g. be as noisy as you possibly can.