IPA: /dɪsˈɡʌstfəl/
KK: /dɪsˈɡʌstfəl/
Causing a strong feeling of dislike or revulsion.
The smell from the garbage was so disgustful that I had to leave the room.
Comparative: more disgustful
Superlative: most disgustful
Disgustful is formed from "dis-" (meaning apart or away) and "gustare" (meaning to taste). The word describes something that causes a strong feeling of aversion or distaste, as if it is pushing one away from a pleasurable experience.
Think of something that makes you feel 'away' ('dis-') from a good 'taste' ('gustare') — that's why disgustful means something that causes strong aversion.