There are single (albeit compound) words in some languages (including English) which describe sensations that would otherwise be cumbersome to explain more than once (e.g. petrichor, schadenfreude, deja vu).
I recently came across the expression "to ring hollow". At first, I thought that was the suitable expression (crudely speaking, not understanding could imply a hyperbolic lack of a brain which would thus a hollow cranium make - hence "ring hollow"). Digging further, I found that it's more akin to a false promise <--> lack of credibility.
So is there a word or an expression in English that conveys:
The feeling when someone doesn't understand your meaning no matter how many different ways you explain it"? Or the feeling when, if what you say does register with the other person, it doesn't register at the level it should?