intrusive or presumptuous, as persons or their actions; insolently rude; uncivil: a brash, impertinent youth.
not pertinent or relevant; irrelevant: an impertinent detail.
Archaic. inappropriate, incongruous, or absurd.
Obsolete. (of persons) trivial, silly, or absurd.

1350–1400; Middle English < Late Latin impertinent- (stem of impertinēns) not belonging. See im-2, pertinent

impertinently, adverb
impertinentness, noun
unimpertinent, adjective
unimpertinently, adverb

1. fresh, bold, insulting, officious, saucy, pert, brazen. Impertinent, impudent, insolent refer to bold, rude, and arrogant behavior. Impertinent from its primary meaning of not pertinent and hence inappropriate or out of place, has come to imply often an unseemly intrusion into what does not concern one, or a presumptuous rudeness toward one entitled to deference or respect: an impertinent interruption, question, manner toward a teacher. Impudent suggests a bold and shameless impertinence: an impudent speech, young rascal. Insolent suggests insulting or arrogantly contemptuous behavior: unbearably insolent toward those in authority.

1. polite. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impertinent (ɪmˈpɜːtɪnənt)
1.  rude; insolent; impudent
2.  irrelevant or inappropriate
[C14: from Latin impertinēns not belonging, from Latin im- (not) + pertinēre to be relevant; see pertain]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "unconnected, unrelated," from L.L. impertinentem (nom. impertinens) "not belonging," lit. "not to the point," from L. in- "not" + pertinens (see pertinent). Sense of "rudely bold" is 1680s, probably modeled on similar use in French, especially by Molière,
from notion of meddling with what is beyond one's proper sphere.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And it seems impertinent to wonder whether she's lonely, what with her jetting
  around all the time and working constantly.
Her wit, for want of teaching, makes her impertinent and talkative.
It seemed that an impertinent fellow had dressed himself up as a preposterous
  parody of myself.
Large figures with wrinkled gray skin, unfamiliar flaps, impertinent hairs and
  heavy limbs.
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