Thallasaphobia Share definition Flag The fear of deep waters and/or sea creatures. David: "Hey, wanna go scuba diving?" Mike: "Sorry man, i have thallasaphobia, its too scary!" Thallasaphobia by Valkyrae May 4, 2020 0 0 Get merch Get the Thallasaphobia mug. Buy Now — $32.95 See more merch