noun an impertinent person.
2. impertinent ·adj trifing; inattentive; frivolous.
3. impertinent ·adj not pertinent; not pertaining to the matter in hand; having no bearing on the subject; not to the point; irrelevant; inapplicable.
4. impertinent ·adj 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.