Telepathetic
Used to describe a person who thinks they can read minds, but can't.
*based from the words "telepathy" and "pathetic"

It is usually used as a punchline when someone tries to read another person's mind and fails to do so.
Used anytime when one person cannot portray one idea to another in any way through telepathy.

Teacher: Since you are all telepathetic, I will communicate the lesson to you all orally.

Psychic: I am telepathic and can read you mind, but only for a small fee.
(client pays small fee)
Client: so can you tell me my real name?
Psychic: no
Client: so that makes you telepathetic!