diabolical 15 synonyms and 9 antonyms for diabolical, ranked by how commonly they're used. Adj — Extremely cruel or wicked; evil. Synonyms for diabolical cacodaemoniacal daemonical demoniac demoniacal demonic demonical demonish demonlike demonly devilish diabolic fallen angelic fiendlike satanic satanical Antonyms for diabolical angelic divine undemonic undevilish undiabolical unsatanic nondemonic nondiabolic nonsatanic ← Back to the full definition of diabolical
