Tedious

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late Middle English: from Old French tedieus or late Latin taediosus, from Latin taedium (see tedium).

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Old French tedieus, from Late Latin taediōsus, from Latin taedium(“weariness, tedium”).

etymonline

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tedious (adj.)

early 15c., from Old French tedieus, from Late Latin taediosus "wearisome, irksome, tedious," from Latin taedium (see tedium). Related: Tediously; tediousness.