IPA: /ɪmˈpɒɪlɪtli/
KK: /ɪmˈpɑɪlɪtli/
In a way that shows a lack of respect or courtesy; behaving rudely or without politeness.
He spoke impolitely to the waiter, which made everyone uncomfortable.
Impoliately → It is formed from "im-" (meaning not) and "polite" (from Latin "politus", meaning polished or refined) and the suffix "-ly" (meaning in a manner of). The word "impolitely" means in a manner that is not polished or refined, hence lacking courtesy or good manners.
Think of 'not' ('im-') being combined with 'polished' ('polite') to remember that 'impolitely' means behaving in a way that is not refined or courteous.