U0117100 (ŭn-spâr′ĭng)adj.1. Unmerciful; severe: an unsparing superior officer; unsparing criticism.2. Generous or unstinting: unsparing in his efforts to find a solution.un·spar′ing·ly adv.un·spar′ing·ness n.Thesaurus
Adv.
1.
unsparingly - in a scathing and unsparing manner; "she criticized him scathingly"scathingly