Definitions:

1. a disposition to be kind and forgiving noun
   • The boisterous children were thankful for the mercifulness of their parents.
2. leniency and compassion shown toward offenders by a person or agency charged with administering justice noun
   • The judges in the state were known for their mercifulness.
3. the feeling that motivates compassion noun
   • My mercifulness led me to start a charity.

Synonyms:

• clemency
• mercy