Source : Webster's Revised Unabridged Dictionary (1913)

Sedulous \Sed"u*lous\, a. [L. sedulus, perhaps from sedere to
   sit, and so akin to E. sit.]
   Diligent in application or pursuit; constant, steady, and
   persevering in business, or in endeavors to effect an object;
   steadily industrious; assiduous; as, the sedulous bee.

         What signifies the sound of words in prayer, without
         the affection of the heart, and a sedulous application
         of the proper means that may naturally lead us to such
         an end?                                  --L'Estrange.

   Syn: Assiduous; diligent; industrious; laborious;
        unremitting; untiring; unwearied; persevering. --
        {Sed"u*lous*ly}, adv. -- {Sed"u*lous*ness}, n.

Source : WordNet®

sedulous
     adj : marked by care and persistent effort; "her assiduous
           attempts to learn French"; "assiduous research";
           "sedulous pursuit of legal and moral principles" [syn:
           {assiduous}]