noun (n)

• a feeling of diffidence and indecision about doing something(noun.feeling)

  Synonym:
  hesitance
  

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

  Example:
  His hesitancy revealed his basic indisposition.
  

  Synonym:
  disinclination, hesitation, indisposition, reluctance
  

  source: wordnet30
• The act of hesitating, or pausing to consider; slowness in deciding; vacillation; also, the manner of one who hesitates.(noun)

  source: webster1913