IPA: /ˌoʊvərˈbɛrɪŋli/
KK: /oʊvərˈbɛrɪŋli/
In a way that is excessively domineering or controlling, often to the point of being oppressive or intolerant.
She spoke overbearingly, making it clear that she would not accept any disagreement.
Overbearingly → It is formed from "over-" (meaning excessively or too much) and "bear" (from Old English "beran", meaning to carry or endure) and the suffix "-ingly" (indicating a manner of doing something). The word describes a manner of carrying or enduring that is excessively domineering or oppressive.
Think of someone who is 'carrying' ('bear') their authority 'excessively' ('over-') — that's why overbearingly means acting in a domineering manner.