seiveillian
A "John Q. Public" figure with a mind dat allows thoughts and good sense to just "filter on through" without making much impression oh his actions or overall behavior.
In one episode of da TV comedy "Sister Sister", Ray is in da middle of chastising Tamera, notices dat she isn't paying any attention, and irritably inquires, "WHY do I get da feeling dat everything I say is goin' IN ONE EAR AND OUT DA OTHER?!". The camera pans to Tamera contemptuously daydreaming while Ray's suddenly-visible dialogue (in da form of a long "tickertaping" strip of white letters) goes slithering effortlessly in her left ear and out her right; she's a classic example of a seiveillian.