If you say that something is disgusting, you are criticizing it because it is extremely unpleasant. It tasted disgusting Smoking is a disgusting habit. = revolting
If you say that something is disgusting, you mean that you find it completely unacceptable. It's disgusting that the taxpayer is subsidising this project. = disgraceful
highly offensive; arousing aversion or disgust; "a disgusting smell"; "distasteful language"; "a loathsome disease"; "the idea of eating meat is repellent to me"; "revolting food"; "a wicked stench"