impertinent impertinent /ˌɪmˈpɝːtənənt/

adjective

1. Improperly forward or bold  ( fresh , impertinent , overbold , impudent , sassy [Informal, N. American] , saucy [Informal] , smart , wise , lippy [Informal] )
   improperly forward or bold
    Don't be fresh with me
   don't be fresh with me
    Impertinent of a child to lecture a grownup
   impertinent of a child to lecture a grownup
    An impudent boy given to insulting strangers
   an impudent boy given to insulting strangers
    Don't get wise with me!
   Don't get wise with me!
   
2. Not pertinent to the matter under consideration  ( immaterial , impertinent , orthogonal , extraneous )
   not pertinent to the matter under consideration
    An issue extraneous to the debate
   an issue extraneous to the debate
    The price was immaterial
   the price was immaterial
    Mentioned several impertinent facts before finally coming to the point
   mentioned several impertinent facts before finally coming to the point
   
3. Characterized by a lightly pert and exuberant quality  ( impertinent , irreverent , saucy , pert )
   characterized by a lightly pert and exuberant quality
    A certain irreverent gaiety and ease of manner
   a certain irreverent gaiety and ease of manner