IPA: /ˈbruːtɪʃli/
KK: /ˈbruːtɪʃli/
In a way that is cruel, violent, or lacking in intelligence; resembling a brute.
He acted brutishly during the argument, showing no regard for others' feelings.
Brutishly → It is formed from "brutish" (from Old French *brut*, meaning rough or savage) and the suffix "-ly" (meaning in a manner of). The word "brutishly" means in a manner that is rough, savage, or lacking in refinement.
Think of the word 'brutish' which describes something rough or savage, and remember that adding '-ly' means it is done in that rough or savage manner.