'disgustingly' originates from the word 'disgust,' which comes from the Old French word 'desgouster,' where 'des-' meant 'opposite of' and 'gouster' meant 'to taste.'

'desgouster' transformed into the Middle English word 'disgousten,' and eventually became the modern English word 'disgust.'

Initially, it meant 'to have a distaste for something,' but over time it evolved into its current meaning of 'to cause revulsion or strong disapproval.'