Added to nouns and adjectives to form adjectives meaning “having the quality of”, either “involving the referent” or “analogous to it”. · Added to verbs to form adjectives meaning "inclined to".
From Middle English dusty, dusti, from Old English dūstiġ, dystiġ, dȳstiġ (“dusty”), equivalent to dust + -y. Cognate with Dutch donzig (“cottony, downy, woolly”), German dunstig (“hazy, misty”).