DictionaryRoot: solere
Latin
solere
to be accustomed
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adjective
insolent
IN-suh-lunt/ˈɪnsələnt/
Boldly rude or disrespectful.
Etymology
Combining “not” with “be accustomed” gave Latin an adjective meaning “unusual, unfamiliar,” but also “arrogant, immoderate.” English preserves that latter sense in behavior showing insulting disregard for others.