IPA: /ˌdɒmɪˈnɪərɪŋli/
KK: /dɑːˈmɪnɪrɪŋli/
In a way that shows a desire to control others or be bossy.
She spoke domineeringly, making it clear that she wanted to be in charge of the project.
Domineeringly → It is formed from "domineer" (from the Latin "dominari", meaning to rule or dominate) and the adverbial suffix "-ly" (meaning in a manner of). The word "domineeringly" means in a manner that asserts control or dominance over others.
Think of someone who 'rules' ('dominari') over others and does so 'in a manner' ('-ly') that is assertive or controlling.