IPA: /ˌɪndɪˈspjuːtəblɪ/
KK: /ɪnˈdɪspjuːtəbli/
In a way that cannot be questioned or denied.
She is indisputably the best player on the team.
Indisputably → It is formed from "in-" (meaning not), "disputare" (meaning to argue or dispute), and the suffix "-ably" (meaning in a manner). The word means not able to be argued against or disputed, indicating certainty.
Think of 'not' ('in-') being able to 'argue' ('disputare') — that's why indisputably means something that cannot be argued against.