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Delicious comes from Middle English delicious, via Old French from Late Latin dēliciōsus, from Latin dēliciae ‘delights’, ultimately from dēliciō ‘to allure’.

1. Proto-Italicc. 1500–700 BCE*lakjō¹‘to draw, pull’reconstructed
2. Latinc. 75 BCE–200 CElaciō¹‘to lure, deceive’
3. Latinc. 75 BCE–200 CEdēliciō¹‘to allure, entice’
4. Latinc. 75 BCE–200 CEdēlicia¹‘pleasure’
5. Latinc. 75 BCE–200 CEdēliciae¹‘delights’
6. Late Latinc. 200–600 CEdēliciōsus¹‘delicate, delicious’
7. Old Frenchc. 842–1400delicious¹
8. Anglo-Normanc. 1066–1400delicious¹
9. Middle Englishc. 1150–1500delicious¹
10. Englishearliest quotation 1749delicious¹

1. ¹ Wiktionary, English delicious
2. Earliest quotation in Wiktionary’s entry: 1749, Henry Fielding, The History of Tom Jones: “Jones had not travelled far before he paid his…”.