IPA: /ˈɪn.sə.ləns/
KK: /ˈɪn.sə.ləns/
A rude or disrespectful attitude or behavior towards others.
His insolence towards the teacher got him in trouble.
Insolence → It is formed from "in-" (meaning not) and "solentia" (from Latin "solens", meaning accustomed or usual). The word describes a behavior that is not usual or customary, particularly in terms of disrespect or rudeness.
Think of 'not' ('in-') being 'accustomed' ('solentia') — that's why insolence means a lack of customary respect.