The word "shoaler" refers to a place where the water is shallow. Antonyms for shoaler include deep, profound, and bottomless. Unlike shallow waters, deep waters are great for swimming, boating, and fishing. Profound waters exhibit a depth that allows large ships and vessels to navigate, while bottomless waters offer mysterious and unknown depths. While shallow water is unsafe for big boats, ships, or sailboats, deep water provides a safe passage for such vessels. In essence, the antonyms for the word shoaler imply a sense of safety and untold depths, compared to shallow waters.