Meaning : Extremely evil or cruel. Expressive of cruelty or befitting hell.
Example :
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.
Synonyms : diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy