Synonyms of the word

flagitious

• adj. (literary) (of people) Guilty of terrible crimes; wicked, criminal.
• adj. (literary) Extremely brutal or wicked; heinous, monstrous.

atrocious

• adj. Frightful, evil, cruel, or monstrous.
• adj. Offensive or heinous.
• adj. Very bad; abominable, disgusting.

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).

grievous

• adj. Causing grief, pain or sorrow.
• adj. Serious, grave, dire or dangerous.

heinous

• adj. Totally reprehensible.

monstrous

• adj. Hideous or frightful.
• adj. Enormously large.
• adj. Freakish or grotesque.
• adj. Of, or relating to a mythical monster; full of monsters.
• adj. (obsolete) Marvellous; strange.