Synonyms of the word

mephistophelean

• adj. Alternative letter-case form of Mephistophelean.

devilish

• adj. Resembling a devil.
• adj. Characteristic of a devil.
• adj. (informal) Extreme, excessive.
• adv. (informal) Devilishly.

diabolic

• adj. Showing wickedness typical of a devil.
• adj. Extremely evil or cruel.

diabolical

• adj. Extremely wicked or cruel.
• adj. Of or concerning the devil; satanic.

evil

• adj. Intending to harm; malevolent.
• adj. Morally corrupt.
• adj. Unpleasant, as in 'an evil smell'.
• adj. Producing or threatening sorrow, distress, injury, or calamity; unpropitious; calamitous.
• adj. (obsolete) Having harmful qualities; not good; worthless or deleterious.
• adj. (computing, programming, slang) undesirable; harmful; bad practice.
• n. Moral badness; wickedness; malevolence; the forces or behaviors that are the opposite or enemy of good.
• n. Anything which impairs the happiness of a being or deprives a being of any good; anything which causes…
• n. (obsolete) A malady or disease; especially in the phrase king's evil (scrofula).