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English word jolly comes from Proto-Germanic *jehwlą, and later Old Norse jól (Yule, midwinter season.)
*jehwlą (Proto-Germanic)
(plural) Yule (literally "the festivities"). Festivity, celebration.
jól (Old Norse)
Yule, midwinter season.
jolif (Old French)
(early Old French) pretty; attractive.
jolif (Middle English)
jolly (English)
(British, dated) very, extremely (British, dated) A pleasure trip or excursion.. (slang, dated) A marine in the English navy. (transitive) To amuse or divert. Full of merriment and high spirits; jovial.