- buoyancy, perkiness - cheerfulness that bubbles to the surface
--1 is a kind of cheerfulness, blitheness
- airiness, buoyancy - the property of something weightless and insubstantial
--2 is a kind of lightness, weightlessness
- irrepressibility, buoyancy - irrepressible liveliness and good spirit; "I admired his bouyancy and persistent good humor"
--3 is a kind of liveliness, life, spirit, sprightliness