Source : Webster's Revised Unabridged Dictionary (1913)

Hesitancy \Hes"i*tan*cy\, n. [L. haesitantia a stammering.]
   1. The act of hesitating, or pausing to consider; slowness in
      deciding; vacillation; also, the manner of one who
      hesitates.

   2. A stammering; a faltering in speech.

Source : WordNet®

hesitancy
     n 1: a feeling of diffidence about doing something [syn: {hesitance}]
     2: a certain degree of unwillingness; "a reluctance to commit
        himself"; "after some hesitation he agreed" [syn: {reluctance},
         {hesitation}, {disinclination}, {indisposition}]