arguably
Definitions
It may be argued; as can be shown by argument.
Used to qualify a statement by suggesting it is a matter of opinion or open to debate.
Examples
She is arguably the most talented musician in the entire orchestra.
This is arguably the best film that the director has ever produced.
Synonyms
possibly debatably conceivably potentially it could be argued open to question
Antonyms
certainly definitely undeniably indisputably unquestionably beyond any doubt