In a boarish manner; in a crude, brutal, coarse, or ill-mannered way.
Boarish + -ly (adverb suffix). Creates the adverbial form to modify verbs and adjectives, indicating the manner in which something is done in a boar-like way.
Adding '-ly' transforms any adjective into an adverb that describes *how* something happens—so 'boarishly' means doing things 'in a brutish way,' just like 'quickly' means doing things 'in a quick way'!
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