Lightness of manner or speech, especially when inappropriate; frivolity.(noun)
The state or quality of being light; buoyancy.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "levity" in a sentence
"He had no patience with levity from the lips of softness."
"“Hooray” adds a certain levity to a written sentence and literally brings a smile to any face when spoken (just say and word and the pronunciation will literally cause your mouth to form a smile-like shape)."
"A bit of levity is good for ones soul occasionally."