IPA: /ɪmˈpɜːtɪnəntli/
KK: /ɪmˈpɜrtɪnəntli/
In a way that is rude or disrespectful, especially towards someone who is considered important or in authority.
She spoke impertinently to her teacher, which surprised everyone in the classroom.
Impertinently → It is formed from "im-" (meaning not) and "pertinens" (from Latin, meaning pertaining or relevant) and the suffix "-ly" (meaning in a manner). The word describes behavior that is not relevant or appropriate, often in a disrespectful way.
Think of 'not' ('im-') being related to something 'pertaining' ('pertinens') to the situation, which helps you remember that 'impertinently' means behaving in a way that is not appropriate or relevant.