different between assiduity vs fastidiousness

English

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “See assiduus”)

assiduity (countable and uncountable, plural assiduities)

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 […]
- 1845, Jordan Roche Lynch, The Hunterian Oration (page 8)
  With the most patient assiduity he peered into the intricacies of unrevealed structure. No object was too minute, none too large, for his attention.
(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.

fastidious +? -ness

fastidiousness (uncountable)

The quality of being fastidious.
- 1974, Graham Greene, The Honorary Consul, Pocket Books, New York, page 30
  A sense of fastidiousness made the doctor choose the left side, near the door, when he slept in it himself with Clara.

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