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The Collaborative International Dictionary
Unsparingness

Unsparing \Un*spar"ing\, a. [Pref. un- not + sparing, p. pr. of spare.]

  1. Not sparing; not parsimonious; liberal; profuse.
    --Burke.

  2. Not merciful or forgiving. [R.]
    --Milton. [1913 Webster] -- Un*spar"ing*ly, adv. -- Un*spar"ing*ness, n.

Wiktionary
unsparingness

n. The state of being unsparing.