different between futility vs otiosity

English

futile +? -ity

futility (usually uncountable, plural futilities)

(uncountable) The quality of being futile or useless.
His taking the bar exam for a third time was pure futility.
(countable) Something, especially an act, that is futile.
- 1843, Thomas Carlyle, Past and Present, book 3, chapter XIII, Democracy
  No man oppresses thee, can bid thee fetch or carry, come or go, without reason shewn. […] No man, wiser, unwiser, can make thee come or go: but thy own futilities, bewilderments, thy false appetites for Money, Windsor Georges and such like?
(uncountable) Unimportance.

otiose +? -ity, from Middle French ociosité, from Latin otiositas, from Latin otiosus + -itas (“-ity”).

otiosity (countable and uncountable, plural otiosities)

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