Levity

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Levity

(n.) 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.
(n.) Lack of gravity and earnestness in deportment or character; trifling gayety; frivolity; sportiveness; vanity.
(n.) Lack of steadiness or constancy; disposition to change; fickleness; volatility.