Hippopotomonstrosesquipedaliophobia is the fear of long words!
Why is the fear of long words such a long word? Well, it is often considered a jocular or fictional phobia, despite the fact that sufferers are claimed to exist, and the word was thus intended to be extremely long, almost jokingly.
It comes from hippopotomonstrosesquipedalian (of or relating to extremely long words), which is an extension of sesquipedalian (of or relating to long words) with monstrum (“monster”) and a truncated, misspelled form of hippopotamus (intended to exaggerate the length of the word itself and the idea of the size of the words being feared), + -phobia.
It is unlikely to be used solely for its meaning; consider instead “sesquipedalophobia” or simply “the fear of long words."
Written by Ava Hill