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Latin word dulce comes from Latin dulcis, Latin -e (-ly; used to form adverbs from adjectives.)
dulcis (Latin)
(figuratively) agreeable, delightful, pleasant, soft, sweet. (figuratively, of persons) friendly, charming, kind, dear, pleasant, agreeable. (of taste) sweet. Sweet-smelling, sweet-scented, fragrant. Sweet-sounding, melodic, melodious, tuneful.
-e (Latin)
-ly; used to form adverbs from adjectives.
dulce (Latin)