DOD regulations are based on several considerations, some of which are U.S. laws. In this case, the U.S. Drug Enforcement Agency categorized hemp seeds, if they contain THC... as an illegal product. (www.dea.gov/pubs/pressrel/pr100901.html)
frightful or hideous, especially in appearance; extremely ugly. 2. shocking or revolting; outrageous: monstrous cruelty. 3. extraordinarily great; huge; immense: a monstrous building.
The definition of horrible is something very frightful, dreadful or shocking. Sour milk is an example of something that would be described as tasting horrible.