noun (n)

• a negative motivational influence(noun.motive)

  Synonym:
  disincentive
  Antonym:
  incentive, inducement, motivator
  

  source: wordnet30
• a communication that makes you afraid to try something(noun.communication)

  Synonym:
  determent, intimidation
  

  source: wordnet30
• the act or process of discouraging actions or preventing occurrences by instilling fear or doubt or anxiety(noun.act)

  source: wordnet30
• That which deters; a deterrent; a hindrance.(noun)

  source: webster1913