敌人对村庄发动了无情的攻击。

The enemy launched a ___merciless attack on the village.

她对他工作的批评是毫不留情的。

She was ___merciless in her criticism of his work.

希拉无情的行为对伊芙的生活产生了深远影响。

Sheila's ___merciless behavior had a profound impact on Eve's life.