Meaning

adjective marked by casual disrespect

adjective unrestrained by convention or propriety; ; ; - Los Angeles Times; ; ; - Bertrand Russell

originPIE word *swé From Middle English, from Old French, from Latin īnsolēns (“unaccustomed, unwanted, unusual, immoderate, excessive, arrogant, insolent”), from in- (privative prefix) + solēns, present participle of solēre (“to be accustomed, to be wont”).

Etymology from Wiktionary, CC BY-SA 3.0