Rude and not showing respect. (Cambridge Dictionary)
Rude behaviour that does not show respect. (Cambridge Dictionary)
The quality or state of being insolent. (Merriam – Webster)
An instance of insolent conduct or treatment. (Merriam – Webster)
Rude and disrespectful behaviour. (Oxford Dictionaries)
Contemptuously rude or impertinent behaviour or speech. (Dictionary.com)
If you say that someone is being insolent, you mean they are being rude to someone they ought to be respectful to. (Collins Dictionary)
What is the difference between insubordination and insolence? There is a thin line between the two – the one could easily be confused with the other.
Definition of Insolence in the Workplace.