Just realized... even If all those in the market were half breed neanderthals, the ad said he wanted the person to be Intelligent. What better way to sift the noobs than use a word that has more than two syllabs

But the word still sits wrong to me. Maybe better... "be impervious to hearing thousands of..." I think the No Rightness comes due to "to listening to" - the second "to" doesn't fit right with the word impervious before it.

Michael Ross