Antonym: pertinent. Similar words: continent, incontinent, subcontinent, inertia, abstinence, diverting, eminent, pertinacity. Meaning: [ɪm'pɜrtɪnənt /-'pɜːt-] 
adj. 1. characterized by a lightly pert and exuberant quality 2. not pertinent to the matter under consideration 3. improperly forward or bold.
adj. 1. characterized by a lightly pert and exuberant quality 2. not pertinent to the matter under consideration 3. improperly forward or bold. 
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1, He was always asking impertinent questions.
2, Don't you get impertinent with me!
3, I hope he didn't think me impertinent when I asked him about his private life.
4, It would be impertinent to suggest that he was always wrong.
5, She found the question highly impertinent.
6, You are an impertinent young woman.
7, Would it be impertinent to ask why you're leaving?
8, Who was this impertinent stranger eyeing her baggage?
9, He was impertinent,(http://sentencedict.com/impertinent.html) rude and arrogant.
10, He must resent the impertinent intrusion of the big car.
11, By now he had gotten used to reporters' impertinent questions about his private life.
12, And as it seems impertinent to invite you to sit down in your own laboratory, I won't.
13, There is no penalty for being impertinent to supervisors who, in turn, quickly learn to keep their advice to themselves.
14, I think I just asked a lot of impertinent questions.
15, It would be impertinent of me to write of Zuckerman.
16, We are too impertinent with the past(sentencedict.com), counting on it in this way for a reliable frisson.
17, It was impertinent of him to behave like that.
18, This is a point impertinent to the argument.
19, His impertinent remarks wasted valuable time.
20, They are grave or impertinent all the day long.
21, They stared or gave impertinent answer.
22, What an impertinent idiot that man is!
23, The impertinent boy put his tongue out at me.
24, His face wore a somewhat quizzical almost impertinent air.
25, I don't like strangers who ask impertinent questions.
26, You are an impertinent little monkey!
27, You are being impertinent, child.
28, She is too free with her tongue and is rather impertinent to people.
29, Could I ask how old you are, or would that be impertinent?
30, But at the same time they are extraordinarily willing to fill out warranty cards, questionnaires and impertinent surveys.
More similar words: continent, incontinent, subcontinent, inertia, abstinence, diverting, eminent, pertinacity, martinet, imminent, prominent, disconcerting, impenitent, impediment, preeminently, impeachment, eminent domain, advertisement, fertile crescent, whimper, impel, impede, eminence, impetus, impeach, imperial, entertainment, imperious, imperfect, fertile.