mercifula.[Mercy + -ful.]1. Full of mercy; having or exercising mercy; disposed to pity and spare offenders; unwilling to punish. Opposite of merciless.()The Lord, the Lord God, merciful and gracious. (Ex. xxxiv. 6.)Be merciful, great duke, to men of mold. (Shak.)2. Unwilling to give pain; compassionate.()A merciful man will be merciful to his beast. (Old Proverb.)()()