In a brutish manner; with animal-like behavior, lack of intelligence, or crude coarseness.
From brutish (adjective meaning savage or animal-like) + -ly (adverbial suffix). Brutish itself comes from brute + -ish.
Shakespeare used 'brutishly' to describe the worst behaviors—it's stronger than 'crudely' because it implies you're acting without thought, purely on base instinct like an animal.
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