Rudeness (also called impudence or effrontery) is the disrespect and failure to behave within the context of a society or a group of people's social laws or etiquette. These laws have already unspokenly been established as the essential boundaries of normally accepted behaviour. It is rude to call someone rude. To be unable or unwilling to align one's behaviour with these laws known to the general population of what is socially acceptable would be considered being rude.

There is an order of severity as to what one might consider being rude:

• Impolite
• Faux pas
• Inconsiderate / Indifference / Selfishness
• Offensive
• Obscene
• Taboo / a crime

Examples of behaviour commonly regarded as rude

The following are examples of behaviour that many societies would consider rude or a breach of etiquette, though views may vary by culture, setting, or individual circumstances:

Rude speech

• Insulting others
• Making politically incorrect comments
• Speaking profanity
• Hate speech
• Use of ethnic slurs
• Interrupting
• Gossiping
• Lying / Rumours
• Talking too much
• Telling a person to shut up, fuck off, etc.
• Telling a person they're stupid, fat/obese, ugly, etc.
• Laughing at / Belittling someone
• Laughing at a person who has disorders/syndromes
• Laughing at a person with deadly or non-deadly diseases like Cancer, Celiac Disease,
• Use of sexual slang
• Describing body functions

Antisocial behaviours

• Failure to dress appropriately for an occasion
• Appearing publicly with poor hygiene
• Refusing or failing to apologize when appropriate
• Failure to express thanks to others
• Failure to tip certain workers, such as waiters or taxicab drivers
• Selfishness
• Cutting in line
• Jealousy / Envy
• Greed
• Not listening
• Not answering when asked a question
• Ignoring a member of a small group
• Snobbery
• Hypocrisy
• Sycophancy
• Apologizing insincerely
• Bullying
• Bigotry
• Excluding someone from a conversation

Rude body actions

• Expelling flatulence in the presence of others
• Nose, ear, or belly button picking in public
• Cutting or biting finger or toe nails in public
• Scratching private parts
• Glaring
• Putting feet up or sitting back on a chair to "relax"
• Yawning or coughing / sneezing without covering one's mouth
• Mooning
• Pointing at someone
• Showing a middle finger

Rude eating / table behaviors

• Neglecting to use proper utensils when handling food
• Failure to use napkins
• Licking the plate
• Slurping
• Chewing with one's mouth open
• Talking while eating food
• Putting elbows on the table
• Taking excessive food from a buffet, especially at a reception
• Eating with one's dirty hands