unmerciful

Having or exhibiting no mercy; merciless.

Exceeding a normal or reasonable limit; excessive.

Not merciful; not influenced by mercy; unkind; cruel; inhuman; merciless: of persons or things.

Unconscionable; exorbitant.

Not merciful; indisposed to mercy or grace; cruel; inhuman; merciless; unkind.

not showing mercy

having or showing no mercy