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. Milton.

— Un‐spar″ing‐ly (#), adv. — Un‐spar″ing‐ness, n.