is,
Blasphemy; also, railing against God or others; also, speaking false words in order to injure another; making severe critical remarks on others or on their writings or manners, often implying uncharitableness or ill-nature.

Let all bitterness, and wrath, and anger, and clamour, and evil-speaking, be put away from you, with all malice. And be ye kind to one another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
Ephesians 4:31-32

Wherefore I say unto you, all manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men. And whosoever speaketh a word against the Son of Man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.
Matthew 12:31-32