im·per·ti·nent 
(ĭm-pûrtn-ənt)
(ĭm-pûrtn-ənt)adj.
1. Exceeding the limits of propriety or good manners; improperly forward or bold: scolded the impertinent child for talking rudely.
2. Not pertinent: See Synonyms at irrelevant.
[Middle English, irrelevant, from Old French, from Late Latin impertinēns, impertinent- : Latin in-, not; see IN-1 + Latin pertinēns, pertinent; see PERTINENT.]
im·perti·nent·ly adv.