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" ;

2. (

• demonic ,
• diabolic ,
• diabolical ,
• fiendish ,
• hellish ,
• infernal ,
• satanic ,
• unholy

) extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him;