rude; insolent
not restrained within due or proper bounds
impertinent curiosity
formal irrelevant; lacking pertinence
impertinence noun
impertinency /-si/ noun
impertinently adv
[Middle English via French from late Latin impertinent-, impertinens, from in-1 + Latin pertinent-, pertinens, present part. of pertinēre: see pertain]