In a domineering manner; in a way that is arrogant, harsh, and overbearing.
From 'domineering' (present participle of 'domineer') + '-ly' (adverbial suffix). A standard formation creating an adverb from the present participle.
The adverb 'domineeringly' adds a layer of judgment—when you describe behavior as 'domineeringly' rather than just 'dominantly,' you're saying the person is *wrong* to act that way, you're moralizing about the behavior, not just describing it objectively.
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