What phobia is for fear of knowing the truth?

Answer 1

I haven't seen referenced any specific name for "fear/phobia of reality". However, the good news is no one stops you from "inventing" it, the way the other phobias' names (and many, many other words) were invented.

The most common way of naming a phobia is to use the Greek word naming the object of that phobia and the -phobia suffix.

Greek for reality being πραγματικότητα(transliterated pragmatikoteta), and for real, πραγματική (transliterated pragmatike), you can safely use pragmatophobia to name the "fear of reality".

As an alternative, the Latin words for the object of the "fear" have been used...

From that point of view, you could use realitophobia (coming from the Medieval Latin word realitas, initially a juridic term for "real estate", derived from the Latin word res, a generic term roughly equivalent to "thing/things"). But that sounds a little too "plain" if you ask me. LE: Ups, I just found out the word "pragmatophobia" was used by the Polish philosopher Zygmund Zawirski in the very title of one of his books, Symbolomania and Pragmatophobia. And, as a personal note: I took "fear of reality" not in the sense of actual fear/terror (like arachnophobia, the fear of Spiders, for instance), but to mean the denial of reality, hiding from it, the unwillingness to acknowledge certain aspects pertaining to reality.

Answer 2

Alethophobia: An abnormal fear of the truth.