/ ʌnˈspeərɪŋ; NAmE -ˈsper-/ adjective ( formal ) unsparing (in sth)
1.
not caring about people's feelings :
She is unsparing in her criticism.
an unsparing portrait of life in the slums
2.
giving or given generously :
He won his mother's unsparing approval.
—compare sparing
► un·spar·ing·ly adverb