arguably UK /ˈɑːɡjuəbli/US /ˈɑɹɡjuəbli/ adverb1 •As can be supported or proven by sound logical deduction, evidence, and precedent, but without absolute certainty.By random chance alone, 99 times out of 100, the Lions should have won an NFL or NFC championship. Worse for arguably the league’s unluckiest fan base, the Lions haven’t really been competitive. — 2022 formsmore arguably · most arguably