Being impertinent is a rude or disrespectful behaviour towards someone. There are several synonyms for the word "be impertinent" such as being insolent, disobedient, disrespectful, cheeky, impudent, rude, and brash. All these words denote a sense of disregard towards authority and a lack of respect for someone's feelings, beliefs, or opinions. Using such words in our communication can often lead to hurt feelings, misunderstandings, and even conflicts. Therefore, it's essential to choose our words carefully when expressing our thoughts and emotions towards others. Being respectful, kind, and compassionate towards each other can go a long way in creating healthy relationships.