Unappetizing food can be described as food that is not particularly appealing or appetizing to eat. GLOP, GRUEL, and SLOP are all examples of unappetizing food. GLOP is a thick, slimy mixture of food, usually made from leftovers. GRUEL is a thin porridge made from oats, barley, or other grains. SLOP is a thin, watery mixture of food, usually made from leftovers. All three of these foods are generally considered unappetizing.