Insolent (adjective)

Showing a rude and arrogant lack of respect; impudent.

Origin:

Insolent is derived from the latin word "insolentus" meaning bold, impudent or disrespectful.

Examples:

1. The customer's insolent attitude towards the server was unacceptable.
2. The employee's insolent behavior towards their supervisor earned them a warning.
3. The student's insolent remarks to the teacher resulted in detention.
4. The actor's insolent attitude on set caused tension among the crew.
5. The businessman's insolent manner towards the client caused the deal to fall through.