The one thing I don't like about English is that it was created by people that never needed to describe how something 'looks' to telepaths. Most human telepaths don't treat their telepathy as a separate sense -- I've spoken to them, and most people speak about colored auras and voices in their heads, and learning how to distinguish those imagined from those perceived -- sight, smell, hearing. Most of them don't get how I can do it without that.
Maybe it's not like describing color to a blind person, but it's like trying to describe red to a colorblind person.