fiendish

Synonyms

atrocious, barbaric, barbarous, brutal, brute, butcherly, cruel, heartless, inhuman, inhumane, sadistic, savage, truculent, vicious, wanton;

Antonyms

benign, benignant, compassionate, good-hearted, humane, kind, kindhearted, sympathetic, tenderhearted;

Near Antonyms

tender, warm, warmhearted;

charitable, clement, lenient, merciful, pitying;

pacific, peaceable, peaceful;

Related Words

hard-hearted, ironhearted, merciless, pitiless, ruthless, stonyhearted, unfeeling;

fell, ferocious, grim;

bloodthirsty, cutthroat, murderous, sanguinary, sanguine;

catty, despiteful, hateful, malevolent, malicious, malign, malignant, mean, nasty, spiteful, vindictive;

draconian, draconic, hardhanded, harsh, heavy-handed, oppressive;

Phrases

red in tooth and claw;