Etymology
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insolent (adj.)

late 14c., "contemptuous, arrogant, showing haughty disregard of others," from Latin insolentem (nominative insolens) "arrogant, immoderate," also "unaccustomed, unwonted," literally "unusual, unfamiliar," from in- "not, opposite of" (see in- (1)) + solentem, present participle of solere "be accustomed, be used to; cohabit with," from Proto-Italic *sol-e-.

This is of uncertain origin. An old guess connects it to the source of Latin sodalis "close companion," and suescere "become used to," but de Vaan rejects this on phonetic grounds. Another guess connects it to the source of Latin solum "ground," with a possible sense shift from "inhabit" to "be accustomed to." Or it might be from PIE root *sel- (1) "human settlement" (source also of Old Church Slavonic selo "courtyard, village," Russian selo "village," Old English sele, Old High German sal "hall, house"). Meaning "contemptuous of rightful authority" is from 1670s. Related: Insolently.

Insolent is now chiefly used of language that is intentionally and grossly rude, defiant, or rebellious. Where it applies to conduct, the conduct includes language as the most offensive thing. [Century Dictionary, 1902]

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Definitions of insolent

insolent (adj.)
marked by casual disrespect;
Synonyms: impudent / snotty-nosed / flip
insolent (adj.)
unrestrained by convention or propriety; "the most bodacious display of tourism this side of Anaheim"- Los Angeles Times; "the modern world with its quick material successes and insolent belief in the boundless possibilities of progress"- Bertrand Russell;
Synonyms: audacious / barefaced / bodacious / bald-faced / brassy / brazen / brazen-faced
From wordnet.princeton.edu