noun (n)

• indecision in speech or action(noun.cognition)

  Synonym:
  vacillation, wavering
  

  source: wordnet30
• a certain degree of unwillingness(noun.attribute)

  Example:
  After some hesitation he agreed.
  

  Synonym:
  disinclination, hesitancy, indisposition, reluctance
  

  source: wordnet30
• the act of pausing uncertainly(noun.act)

  Example:
  There was a hesitation in his speech.
  

  Synonym:
  falter, faltering, waver
  

  source: wordnet30
• The act of hesitating; suspension of opinion or action; doubt; vacillation.(noun)

  source: webster1913