Synonyms of sadistic

adjectiveDelighting in or feeling pleasure from the pain or humiliation of others.

• demonicExtremely cruel or evil; abhorrent or repugnant; diabolical.
• inhumanOf or pertaining to inhumanity and the indifferently cruel, sadistic or barbaric behavior it brings.
• spitefulFilled with, or showing, spite; having a desire to annoy or harm.
• barbarousMercilessly or impudently violent or cruel, savage.
• brutalSavagely violent, vicious, ruthless, or cruel, often in an unintelligent manner.
• compassionlessWithout compassion; hardhearted.
• cruelIntentionally causing or reveling in pain and suffering; merciless, heartless.
• flagitious formal
• diabolic figurativelyWicked; evil; cruel.
• diabolical figurativelyExtremely wicked or cruel.
• fellOf a strong and cruel nature; eager and unsparing; grim; fierce; ruthless; savage.
• incessiveFierce; cruel and aggressive.
• inhumane
• maliciousIntending to do harm; characterized by spite and malice.
• mercilessShowing no mercy; cruel and pitiless.
• nastySpiteful, unkind.
• nonhumaneNot humane, inhumane.
• pitilessHaving, or showing, no pity; merciless, ruthless.
• remorselessWithout remorse, mercy or pity.
• rottenCruel, mean or immoral.
• ruthlessWithout pity or compassion; cruel, pitiless.
• savageBrutal, vicious, or merciless.
• truculentCruel or savage.
• unbenevolentNot benevolent.
• unbenignNot benign; malevolent.
• unkind
• unmercifulNot showing mercy.
• unpityingNot feeling or showing pity.
• bowelless obsoleteWithout pity.
• despiteful archaicFull of despite; expressing malice or contemptuous hate.
• inclement obsoleteMerciless, unrelenting.
• unpitiful archaicWithout pity; pitiless.