rude

Many synonyms of rude suggest a violation of manners or propriety, including
impolite, bad-mannered, ill-mannered, mannerless, unmannerly, and discourteous.

A word that suggests that a person doesn’t know how to interact with others—or doesn’t care how they do—is tactless.

Words that suggest a more active, deliberate rudeness are disrespectful, insolent, and impertinent.

People who are overly blunt or aggressive might be described as brash, brusque, crude, or boorish.

The word uncivil implies that someone is behaving in a way that ignores common courtesy.

A generally rude person might be called a jerk (or worse names).

Rude can also describe something that is crudely made. The word crude can also be used as a synonym of this sense.

A more polite word for rude is, fittingly, impolite. Rude typically has an accusatory and judgmental tone. Along with impolite, synonyms that avoid this are impertinent, uncouth, and discourteous.

Someone who’s called rude might also be considered mean—malicious toward others. When you behave rudely, you treat others poorly in some way, and that can be seen as mean. But meanness doesn’t necessarily always involve rudeness. There are plenty of ways to be mean outside of violating manners and etiquette, which is what rude usually implies. A person can even be mean while appearing to be polite.

The phrase rude awakening refers to an instance of being suddenly—rudely—forced to face an unpleasant fact. A similar term is eye-opener.