ruthless (adj.)
- animal
- anthropophagous
- atrocious
- barbaric
- barbarous
- beastly
- bestial
- bloodthirsty
- bloody
- bloody-minded
- bowelless
- brutal
- brute
- brutish
- callous
- cannibalistic
- cruel
- demoniac
- demoniacal
- devilish
- diabolic
- fell
- feral
- ferine
- ferocious
- fiendish
- fierce
- flinty
- hard
- harsh
- heartless
- hellish
- implacable
- inclement
- inexorable
- infernal
- inhuman
- inhumane
- malign
- malignant
- mean
- merciless
- mortal
- murderous
- noncivilized
- pitiless
- relentless
- remorseless
- sadistic
- sanguinary
- sanguineous
- satanic
- savage
- severe
- subhuman
- tough
- truculent
- unappeasable
- unchristian
- uncivilized
- uncompassionate
- unfeeling
- unflinching
- unforgiving
- ungentle
- unhuman
- unmerciful
- unpitying
- unrelenting
- unremorseful
- unsympathetic
- unsympathizing
- untamed
- unyielding
- vicious
- wild
- wolfish
Ruin seize thee, ruthless king!
Confusion on thy banners wait!
Though fann'd by Conquest's crimson wing,
They mock the air with idle state.
