uncouthly

/ʌnˈkuːθli/
adverb
  1. In a way that is rude, awkward, or lacking good manners and refinement.
    • She uncouthly slurped her soup at the formal dinner, drawing disapproving looks.
    • The tourist uncouthly barged to the front of the line without apologizing.
    • He uncouthly interrupted the speaker with a loud, irrelevant comment.
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