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English word sickly-sweet comes from English sweet, and later English sickly sweet (Too sweet; sickeningly sweet.)
sweet (English)
(countable, British) A confection made from sugar, or high in sugar content; a candy.. (countable, British) A food eaten for dessert.. (obsolete) Sweetness, delight; something pleasant to the mind or senses.. (obsolete) That which is sweet or pleasant in odour; a perfume.. (uncountable) The basic taste sensation induced by sugar.. Sweetheart; darling. (informal) Very pleasing; agreeable.. [...]
sickly sweet (English)
Too sweet; sickeningly sweet.