unsparing in WordNet English dictionary

1. very generous
   "distributed gifts with a lavish hand"; "the critics were lavish in their praise"; "a munificent gift"; "his father gave him a half-dollar and his mother a quarter and he thought them munificent"; "prodigal praise"; "unsparing generosity"; "his unstinted devotion"; "called for unstinting aid to Britain"
   lavish  munificent  overgenerous  too-generous  unsparing  unstinted  unstinting 
   
2. not forbearing; ruthless
   "an unsparing critic"
   unsparing