In senses related to foul, adj. I. The quality or state of being revolting or disgusting to the senses, esp. through being rotten, putrid, or…

objectively. The quality of being hideous: dreadfulness; horrible repulsiveness. (See the adjective.)

The quality of being indigestible or nauseating; sickliness or offensiveness of taste. Also: the state of being surfeited, satiety; (figurative)…

The state or quality of being revolting; repulsiveness.

The quality of being disgusting; an instance of this.

figurative. Grimness, repulsive character.