Rude or disrespectful behavior, especially when someone acts too familiar or doesn't show proper respect to someone in authority.
From Latin 'impertinens' meaning 'not belonging' or 'irrelevant.' The prefix 'im-' means 'not' and 'pertinens' means 'appropriate' or 'fitting.'
Originally 'impertinent' just meant 'irrelevant,' but people started using it to describe rude comments that were inappropriately inserted into conversations—and that meaning stuck permanently!
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