Synonyms for Cruel:

adj.

brutal (adjective)
rude, carnal, barbarous, ferocious, coarse, brutish, ruthless, brutal, savage, gross, inhuman, rough, bestial.
diabolical (adjective)
Fiendish.
hateful (adjective)
spiteful.
murderous (adjective)
bloodthirsty.
painful (adjective)
oppressive, painful, odious, Gnawing, insufferable, Torturing., hurtful, bitter, stabbing, inflaming, woeful, disagreeable, distressful, annoying, wrenching, bothersome, trying, smarting, piercing, Irksome, Besetting, stinging, aggravating, harrowing, grievous, offensive, agonizing, sore, horrendous, arduous, throbbing, grueling, unbearable, cutting, biting, aching, unpleasant, tormenting, withering, acute, miserable, Cramping, burdensome, irritating, anguishing, excruciating, crushing, chafing, severe, troublesome, uncomfortable.
pitiless (adjective)
ruthless, bloodthirsty, uncompassionate, unmerciful, hellish, inhumane, merciless, demoniac, Fiendish, unforgiving, hardhearted, dog-eat-dog, unfeeling, pitiless, cutthroat, brutal, barbaric, unsympathetic, stony, unpitying.
severe (adjective)
severe.
unjust (adjective)
unfair.
vicious, pitiless; causing pain (adjective)
bloodthirsty, ruthless, unfeeling, sinful, excruciating, tyrannical, inhuman, callous, vengeful, sadistic, merciless, hateful, inexorable, rancorous, bestial, inhumane, painful, heartless, ferocious, depraved, wicked, unkind, malevolent, bitter, unnatural, degenerate, spiteful, revengeful, hellish, brutish, barbarous, vicious, relentless, virulent, demoniac, harsh, hard, brutal, pernicious, monstrous.

adv

beastly (adverb)
swinish.

n.

hateful, awful, uncharitable. sadistic. help. cruel (noun)
roughshod, hard, brutal, savage, inhumane, harsh, fell, heartless, vicious, unkind, rigorous, barbarous.
unfair (noun)
unjustified, unreasonable, unfair, partial, arbitrary, one-sided, unjust, biased, wrongful, unequal.

Other synonyms:

wolfish, unnatural, tyrannical, remorseless, satanic, wicked, monstrous, unsparing. awful. cruel
sadistic.
fierce
truculent.
harsh
harsh.
heartless
heartless.
implacable
inexorable, relentless.
injurious
harmful.
ruthless
inclement.
unfeeling
callous.
unforgiving
uncharitable.
unkind
unkind.
vicious
vicious.
vindictive
revengeful.

Usage examples for cruel

  1. Love has been more cruel to me than death." – The Mettle of the Pasture by James Lane Allen
  2. It wasn't cruel dear; it was kind. – Miss Billy by Eleanor H. Porter
  3. Alexandrine, you are cruel – The Fatal Glove by Clara Augusta Jones Trask