- fiendish
- adj1. inhuman, barbarous, barbaric, savage, Tartarian, Hunnish, Vandalic; brutal, brutish, murderous, slaughterous, bloodthirsty, sanguinary, sadistic, ogreish; terrible, harsh, fell, truculent; ferocious, ruthless, vicious, feral, ferine; pitiless, merciless, heartless, unkind, unfeeling, cruel, hardhearted, stony-hearted, cold-blooded; unrelenting, relentless, remorseless, inexorable.2. demonic, diabolic, diabolical, devilish, ghoulish; satanic, Mephistophelian, demonian, demoniac, demoniacal, cacodemonic; infernal, hellish, hellborn.3. damnable, execrable, accursed, abominable, horrible, horrid, hideous, monstrous, atrocious; base, vile, odious, obnoxious, villainous, sinister; wicked, iniquitous, evil, sinful, ungodly, impious, Obs. scelerous, black-hearted, corrupt, depraved, Archaic. facinorous; nefarious, flagitious, unspeakable, heinous; profligate, immoral, dissolute, vitiated, perverted, perverse; pestilential, malevolent, malicious, malign, maleficent, malefic, venomous; dire, black, dreadful, baleful
A Note on the Style of the synonym finder. 2014.