0 humour or lack of seriousness, especially during a serious occasion:
a brief moment of levity amid the solemn proceedings
1 amusement or lack of seriousness:
a moment of levity
Sometimes, this conclusion can have a supercilious air - niceness can easily be reduced to levity or fecklessness.
What connection is there between levity and heat, or gravity and cold?
No sorrow, no salutary terror, no abhorrence, no seriousness; nothing but ribaldry, debauchery, levity, drunkenness, and flaunting vice in fifty other shapes.
The first is one of levity.
He treated it with a little levity at one stage in his speech.
She needs to treat the matter with some seriousness, not levity, in her winding-up speech.
No one has accused him, or ever would, of levity.
I think the levity on the other side is rather misplaced.