different between unwillingness vs indisposition

English

unwilling +? -ness

unwillingness (countable and uncountable, plural unwillingnesses)

From Middle English indisposicioun, from Middle French indisposicion.

indisposition (countable and uncountable, plural indispositions)

A mild illness, the state of being indisposed.
- 1751, Henry Fielding, Amelia, Book 3, Chapter 7,^[1]
  I was scarce sooner recovered from my indisposition than Amelia herself fell ill.
- 1817, Jane Austen, Persuasion, Chapter 23,^[2]
  She began not to understand a word they said, and was obliged to plead indisposition and excuse herself.
A state of not being disposed to do something; disinclination; unwillingness.
- 1989, Thomas Robert Malthus, John Pullen, Principles of Political Economy (volume 2, page 435)
  He argued that the progress of wealth could be impeded not only by an indisposition to produce, but also by an indisposition to consume […]
A bad mood or disposition.
- 1597, Francis Bacon, Essays
  Doth any man doubt, that if there were taken out of men's minds, vain opinions, flattering hopes, false valuations, imaginations as one would, and the like, but it would leave the minds, of a number of men, poor shrunken things, full of melancholy and indisposition, and unpleasing to themselves?

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