verb (v)

• make less visible or unclear(verb.perception)

  Synonym:
  becloud, befog, cloud, fog, haze over, mist, obscure
  

  source: wordnet30
• make unclear, indistinct, or blurred(verb.cognition)

  Example:
  Their words obnubilate their intentions.
  

  Synonym:
  blur, confuse, obscure
  

  source: wordnet30
• To cloud; to obscure.(verb)

  source: webster1913