IPA: /ˈɪn.sə.lənt/
KK: /ˈɪn.sə.lənt/
Showing a lack of respect or being rude in a bold way.
The student's insolent behavior got him in trouble with the teacher.
Insolent → It is formed from "in-" (meaning not) and "solens" (from the Latin verb "solere", meaning to be accustomed or to be used to). The word "insolent" describes someone who is not accustomed to showing respect, hence being rude or disrespectful.
Think of someone who is 'not' ('in-') used to being respectful — that's why insolent means rude or disrespectful.