levity

[lev-i-tee]
noun, plural levities.
1.
lightness of mind, character, or behavior; lack of appropriate seriousness or earnestness.
2.
an instance or exhibition of this.
4.
lightness in weight.

Origin:
1555–65; < Latin levitās lightness, frivolity, equivalent to levi(s) light + -tās -ty2


1, 2. frivolity, flippancy, triviality, giddiness.
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World English Dictionary
levity (ˈlɛvɪtɪ)
 
n , pl -ties
1.  inappropriate lack of seriousness
2.  fickleness or instability
3.  archaic lightness in weight
 
[C16: from Latin levitās lightness, from levis light]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

levity
1560s, from L. levitas (gen. levitatis) "lightness, frivolity," from levis "light" in weight (see lever) + -ity.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Aye, but arguments can become tedious, and sometimes rampant imagination may
  add levity to an otherwise heavy discussion.
They that desire to excel in too many matters, out of levity and vain glory,
  are ever envious.
The simple rise as by specific levity not into a particular virtue, but into
  the region of all the virtues.
One of his friends he would never be prevailed upon to admit among the clergy,
  on account of some levity in his carriage.
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