In a manner that is full of or causes disgust; repulsively.
From 'disgustful' plus '-ly', stacking two suffixes to convert the adjective into an adverb. This kind of suffix layering shows the modular nature of English word formation.
English allows writers to layer suffixes like '-ful' and '-ly' to fine-tune meaning, and while 'disgustfully' sounds archaic, it represents a grammatical freedom that lets speakers be maximally creative with word building.
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