IPA: /ɪmˈpɪəriəsli/
KK: /ɪmˈpɪrɪəsli/
In a way that shows dominance or authority, often in a commanding or overbearing manner.
She spoke imperiously, expecting everyone to obey her orders without question.
Imperiously → It is formed from "imperious" (from Latin "imperiosus", meaning commanding or authoritative) and the suffix "-ly" (meaning in a manner of). The word "imperiously" means in a commanding or authoritative manner.
Think of someone acting in a commanding way — 'imperious' means authoritative, and '-ly' indicates the manner of that action.