From BiblePortal Wikipedia

King James Dictionary [1]

Cruel, a. L. See Crude and Rude.

1. Disposed to give pain to others, in body or mind willing or pleased to torment, vex or afflict inhuman destitute of pity, compassion or kindness fierce ferocious savage barbarous hardhearted applied to persons or their dispositions.

They are cruel, and have no mercy.  Jeremiah 6 .

2. Inhuman barbarous savage causing pain, grief or distress exerted in tormenting, vexing or afflicting.

Cursed be their wrath, for it was cruel.  Genesis 44 .

The tender mercies of the wicked are cruel.  Proverbs 12 .

Others had trials of cruel mockings.  Hebrews 11 .

Webster's Dictionary [2]

(1): (a.) Causing, or fitted to cause, pain, grief, or misery.

(2): (a.) Attended with cruetly; painful; harsh.

(3): (a.) Disposed to give pain to others; willing or pleased to hurt, torment, or afflict; destitute of sympathetic kindness and pity; savage; inhuman; hard-hearted; merciless.

(4): (n.) See Crewel.