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Definition of impertinent : 1. An impertinent person.
2. Contrary to, or offending against, the rules of propriety or good breeding; guilty of, or prone to, rude, unbecoming, or uncivil words or actions; as, an impertient coxcomb; an impertient remark.
3. Not pertinent; not pertaining to the matter in hand; having no bearing on the subject; not to the point; irrelevant; inapplicable.
4. Trifing; inattentive; frivolous.

Synonyms:

opposed, boldfaced, contradictory, remote, sweet, brassy, heady, refreshful, relevant, smart, nonmaterial, sassy, judicious, godless, indifferent, overbold, unfermented, pushy, distant, fresh, orthogonal, novel, malapert, snippy, unconnected, flip, hostile, incorporeal, wise to, invigorated, uppish, refreshing, contrasted, chic, courtesy, clean, bright, unlike, assumptive, conflicting, spirited, forward, contumelious, reinvigorated, nervy, refreshed, tonic, brisk, uppity, voguish, assuming, pert, wise, new, contrary, familiar, bracing, snippety, presuming, attitude, overconfident, unused, knowing, snotty-nosed, smart-alecky, rectangular

coarse, brutish, uncouth, ill-mannered, uncivilized, tactless, caddish, uncivil, crude, barbarous, vulgar

extrinsic, inappropriate, inadmissible, outer, extraneous, dissociated, nonessential, estranged, eerie, separated, foreign, extraterrestrial, disconnected, outlandish, strange, unaffiliated, foreign-born, other, alien, immaterial, detached, parenthetical, outside, removed, segregated, inapplicable, separate, exotic, unessential, unallied, disjoint, external, irrelevant, unrelated, disaffiliated

callous, saucy, arrogant, brash, rude, discourteous, impolite, cheeky, outrageous, defiant, outspoken, brazen, disrespectful, candid, audacious, insolent, flagrant, irreverent, mouthy, presumptuous, insubordinate, contemptuous, sacrilegious, bold, derisive, sarcastic

improper, impudent

Usage examples:

• If it's not an impertinent question, Captain Headland, may I ask if you have been in this part of the country before? - "Won from the Waves", W.H.G. Kingston.
• She emerged from her dreams to be impertinent. - "The Way of Ambition", Robert Hichens.
• If you don't ask impertinent questions, or ones that I think I ought to get more than double wages for answering, why, I am with you." - "An Artist in Crime", Rodrigues Ottolengui.