/ ɪmˈpɜːtɪnənt; NAmE -ˈpɜːrtn-/ adjective
rude and not showing respect for sb who is older or more important
SYN impolite :
an impertinent question / child
Would it be impertinent to ask why you're leaving?
➡ note at rude
► im·per·tin·ence / -əns; NAmE / noun [ U , C , usually sing. ]:
She had the impertinence to ask my age!
► im·per·tin·ent·ly adverb
••
WORD ORIGIN
late Middle English (originally referring to something as irrelevant): from Old French , or from late Latin impertinent- not having reference to, from Latin in- not + pertinere pertain.