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Synonyms
as·sid·u·ous (ə-sĭj́ōō-əs)

[From Latin assiduus, from assidēre, to attend to, ad-, ad-, + sedēre, to sit.]

adjective 

  1. Constant in application or attention; diligent: an assiduous worker who strove for perfection. See synonyms at busy
  2. Unceasing; persistent: assiduous research.

derivatives

as·sid́u·ous·ly
adverb
as·sid́u·ous·ness
noun