1. showing no mercy or restraint; harsh or severe
2. giving or using generously without holding back

Examples

• The critic’s unsparing review destroyed the actor’s confidence.
• She was unsparing in her criticism of the government’s policies.
• The coach gave an unsparing assessment of the team’s performance.
• He was unsparing with his praise for the volunteers.
• The documentary provided an unsparing look at poverty in the city.
• She was unsparing in her efforts to help the homeless.
• The judge was unsparing in his sentencing of the criminal.