IPA: /prɪˈzumɪŋli/
KK: /prɪˈzumɪŋli/
In a way that shows confidence or arrogance, often without sufficient evidence or proof.
She presumingly assumed that everyone would agree with her opinion.
Presumingly → It is formed from "pre-" (meaning before) and "sumere" (meaning to take). The word refers to taking something for granted or assuming something beforehand.
Think of 'taking' something 'before' — that's why presumingly means assuming something in advance.