Levity /(lĕv"ĭ*ty̆)/

Lev·i·ty

Levity

n.
  1. The quality of weighing less than something else of equal bulk; relative lightness, especially as shown by rising through, or floating upon, a contiguous substance; buoyancy; -- opposed to gravity.
    He gave the form of levity to that which ascended; to that which descended, the form of gravity.
    — Sir. W. Raleigh.
    This bubble by reason of its comparative levity to the fluidity that incloses it, would ascend to the top.
  2. Lack of gravity and earnestness in deportment or character; trifling gayety; frivolity; sportiveness; vanity.
    He never employed his omnipotence out of levity.
    — Calamy.
  3. Lack of steadiness or constancy; disposition to change; fickleness; volatility.
    The levity that is fatigued and disgusted with everything of which it is in possession.