assiduity

assiduity (countable and uncountable, plural assiduities)

1. Great and persistent toil or effort.
   • 1661, John Fell, The Life of the most learned, reverend and pious Dr. H. Hammond

     During the whole time of his abode in the university he generally spent thirteen hours of the day in study; by which assiduity besides an exact dispatch of the whole course of philosophy, he read over in a manner all classic authors that are extant […]

2. (in the plural) Constant personal attention, solicitous care.
   • 1559, translated by Thomas Paynell: Erasmus, The Complaint of Peace (1521)

     With difficulty could man be born into the world, or as soon as born would he die, leaving life at the very threshold of existence, unless the friendly hand of the careful matron, and the affectionate assiduities of the nurse, lent their aid to the helpless babe.

   • 1773, Oliver Goldsmith, She Stoops to Conquer

     I will stay even contrary to your wishes; and though you should persist to shun me, I will make my respectful assiduities atone for the levity of my past conduct.