lightness

(n) a feeling of joy and pride high spirits, elation,
(n) the property of being comparatively small in weight
- the lightness of balsa wood
weightlessness,
(n) the gracefulness of a person or animal that is quick and nimble agility, legerity, lightsomeness, nimbleness,
(n) having a light color
(n) the visual effect of illumination on objects or scenes as created in pictures
- he could paint the lightest light and the darkest dark
light,
(n) the trait of being lighthearted and frivolous lightsomeness,

high spirits elation weightlessness agility legerity lightsomeness nimbleness light

heaviness weightiness darkness