Synonyms of possibly in English:

possibly


See US English definition of possibly

See UK English definition of possibly

adverb

1‘possibly he took the boy with him’

SYNONYMS
perhaps, maybe, it could be, it may be, it is possible, it is conceivable, for all one knows, feasibly, very likely
hopefully, God willing
Northern English happen
literary peradventure, perchance, mayhap, haply
rare percase

2‘you can't possibly refuse’

SYNONYMS
conceivably, under any circumstances, by any means, at all, in any way

3‘could you possibly spare me a few moments?’

SYNONYMS
please, kindly, be so good as to
by any chance, if possible