impertinent means not pertinent and if that's not the opposite of pertinent then I must not know what opposite actually means

Larehip

now that I'm definitely sure I don't know what it means

Impertinent means rude.

https://i.imgur.com/zYqgVPp.png

I guess one definition does

Being rude means that you're not acting appropriately for a scenario so...

I don't think I've ever heard anyone use impertinent in that way and I don't think I ever will.

Do you think that you'll ever hear anyone use impertinent period?

I'll certainly hear the former before the latter.