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adj. Showing or characterized by persistent attention or untiring application: an assiduous worker who strove for perfection; did assiduous research before writing the book. See Synonyms at diligent. [From Latin assiduus, from assidēre, to attend to : ad-, ad- + sedēre, to sit; see sed- in the Appendix of Indo-European roots.] as·sidu·ous·ly adv. as·sidu·ous·ness n. |
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