Etymology
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tiresome (adj.)

"tedious," c. 1500, from tire (v.) + -some (1). Related: Tiresomely; tiresomeness.

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repetitious (adj.)

"employing repetition," often with suggestions of tiresomeness, 1670s, from Latin repetit-, past-participle stem of repetere "do or say again" (see repeat (v.)) + -ous. Compare repetitive. Regarded in 19c. England as an Americanism. Related: Repetitiously; repetitiousness.

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