lightness
light-ness
noun
A cheerful, carefree, or unburdened quality in mood or manner.
"His humour brought a welcome lightness."
noun
The degree of brightness or pale shade in a colour or illumination.
"She admired the lightness of the watercolour."
noun
The quality of having very little weight; being easy to lift.
"The fabric's lightness made it float."
Thesaurus
Synonyms: weightlessness, light, high spirits, elation, lightsomeness, legerity, nimbleness, agility
Antonyms: darkness, heaviness, weightiness