Rude describes a type of behavior that isn't appropriate and usually isn't very nice, either — like yelling "You stink!" at a children's talent show.

Rude refers to bad behavior or just plain bad manners. For example, children are taught to say "please" and "thank you" or they are considered rude. A rude person needs a little work — rude also means crude or basic, like a rude cabin out in the woods that barely keeps the rain out. It can be a sudden realization, too. If you wake up and see your breath, it's a rude awakening that the heat's not working.

Definitions of rude
  1. adjective
    belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
    synonyms: crude, primitive
    being or occurring at an early stage of development
  2. adjective
    (used especially of commodities) being unprocessed or manufactured using only simple or minimal processes
    “bales of rude cotton”
    synonyms: natural, raw
    not altered from an original or natural state
  3. adjective
    socially incorrect in behavior
  4. adjective
    (of persons) lacking in refinement or grace
    synonyms: bounderish, ill-bred, lowbred, underbred, yokelish
    (used of persons and their behavior) not refined; uncouth
  5. adjective
    lacking civility or good manners
    synonyms: uncivil
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    civil, polite
    not rude; marked by satisfactory (or especially minimal) adherence to social usages and sufficient but not noteworthy consideration for others
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