Source : Webster's Revised Unabridged Dictionary (1913)

Liveliness \Live"li*ness\, n. [From {Lively}.]
   1. The quality or state of being lively or animated;
      sprightliness; vivacity; animation; spirit; as, the
      liveliness of youth, contrasted with the gravity of age.
      --B. Jonson.

   2. An appearance of life, animation, or spirit; as, the
      liveliness of the eye or the countenance in a portrait.

   3. Briskness; activity; effervescence, as of liquors.

   Syn: Sprightliness; gayety; animation; vivacity; smartness;
        briskness; activity. -- {Liveliness}, {Gayety},
        {Animation}, {Vivacity}. Liveliness is an habitual
        feeling of life and interest; gayety refers more to a
        temporary excitement of the animal spirits; animation
        implies a warmth of emotion and a corresponding
        vividness of expressing it, awakened by the presence of
        something which strongly affects the mind; vivacity is a
        feeling between liveliness and animation, having the
        permanency of the one, and, to some extent, the warmth
        of the other. Liveliness of imagination; gayety of
        heart; animation of countenance; vivacity of gesture or
        conversation.

Source : WordNet®

liveliness
     n 1: general activity and motion [syn: {animation}]
     2: animation and energy in action or expression; "it was a
        heavy play and the actors tried in vain to give life to
        it" [syn: {life}, {spirit}, {sprightliness}]