unseptpentanovodiniloctonilunophobia Share definition Flag Morbid and irrational fear of the number 175,920,801. Unseptpentanovodiniloctonilunophobia. The one fear nobody dares talk about. unseptpentanovodiniloctonilunophobia by Fearman November 22, 2007 0 0 Get merch Get the unseptpentanovodiniloctonilunophobia mug. Buy Now — $32.95 See more merch