capriciousness

From capricious +‎ -ness.

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capriciousness (uncountable)

1. The quality of being capricious.
   • 1827, Jeremy Bentham, John Stuart Mill, Rationale of Judicial Evidence, Specially Applied to English Practice:

     To employ always the same witnesses, he would excite speculation, and expose himself to the imputation of fickleness or capriciousness.