ar·gu·ably 
/ˈɑɚgjuwəbli/ adverb
/ˈɑɚgjuwəbli/ adverb : it can be argued — used to say that a statement is very possibly true even if it is not certainly true ▪ He is arguably the best writer of his generation. [=he may well be the best writer of his generation] ▪ It is arguably the busiest airport in the world.
