debatably

/dɪˈbeɪtəbli/
adverb
  1. In a way that is open to question or argument; used to express that something is not certain or agreed upon.
    • Debatably, the best part of the movie is the ending, though some fans disagree.
    • Her decision to leave her job was debatably the right move, given the risks.
    • The new policy is debatably more fair than the old one, but opinions vary widely.