Darkness

n.
  1. The absence of light; blackness; obscurity; gloom.
  2. A state of privacy; secrecy.
  3. A state of ignorance or error, especially on moral or religious subjects; hence, wickedness; impurity.
  4. Want of clearness or perspicuity; obscurity; as, the darkness of a subject, or of a discussion.
  5. A state of distress or trouble.
    6. Prince of darkness ,
    the Devil; Satan.