Nouns

(n)buoyancy, perkinesscheerfulness that bubbles to the surface
(n)airiness, buoyancythe property of something weightless and insubstantial
(n)buoyancythe tendency to float in water or other liquid
(n)irrepressibility, buoyancyirrepressible liveliness and good spirit“I admired his buoyancy and persistent good humor”