Antonyms of adj diabolical

2 senses of diabolical

Sense 1
devilish, diabolic, diabolical, mephistophelian, mephistophelean -- (showing the cunning or ingenuity or wickedness typical of a devil; "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye")

INDIRECT (VIA evil) -> good -- (morally admirable)

Sense 2
demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy -- (extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces")

INDIRECT (VIA evil) -> good -- (morally admirable)

Similarity of adj diabolical

2 senses of diabolical

Sense 1
devilish, diabolic, diabolical, mephistophelian, mephistophelean -- (showing the cunning or ingenuity or wickedness typical of a devil; "devilish schemes"; "the cold calculation and diabolic art of some statesmen"; "the diabolical expression on his face"; "a mephistophelian glint in his eye")
       => evil (vs. good) -- (morally bad or wrong; "evil purposes"; "an evil influence"; "evil deeds")

Sense 2
demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy -- (extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces")
       => evil (vs. good) -- (morally bad or wrong; "evil purposes"; "an evil influence"; "evil deeds")