The prefix in "disgusting" is "dis-". It means "not" or "opposite of".
Here's why:
* "Dis-" is a common prefix in English, and it often adds a negative meaning to the word it's attached to.
* "Gust" is a root word that means "taste" or "enjoyment."
* "Disgusting" means something that is unpleasant or repulsive to the senses.
So, "disgusting" literally means "not enjoyable" or "opposite of enjoyable."