1. showing no mercy or compassion; cruel and harsh

Examples

• The unmerciful dictator showed no pity for his enemies.
• She gave him an unmerciful beating in the chess match.
• The unmerciful heat made working outdoors nearly impossible.
• His unmerciful criticism left her feeling devastated.
• The judge was unmerciful in his sentencing of the repeat offender.
• The unmerciful wind battered the small boat all night.