IPA: /ʌnˈɑːɡjʊəbli/
KK: /ʌnˈɑrɡjʊəbli/
In a way that cannot be questioned or doubted; certainly.
She is unarguably the best player on the team.
Unarguably → It is formed from "un-" (meaning not) and "arguable" (from Latin "arguabilis", meaning able to be argued). The word means something that cannot be argued against or is indisputable.
Think of something that is 'not' ('un-') able to be 'argued' ('arguable') — that's why unarguably means it cannot be disputed.