IPA: /ɪmˈpoʊlaɪt/
KK: /ɪmˈpoʊlaɪt/
Not showing good manners; rude or disrespectful in behavior or speech.
It is impolite to interrupt someone while they are speaking.
Impolite is formed from the prefix "im-" (meaning not) and the root "polite" (from Latin "politus", meaning polished or refined). The word describes behavior that is not polished or refined, hence lacking good manners.
Think of 'not' ('im-') being combined with 'polished' ('polite') to remember that 'impolite' means lacking refinement or good manners.