buoyancy

noun

1. cheerfulness that bubbles to the surface

Similar word(s): perkiness

Definition categories: feeling, blitheness, cheerfulness

2. the property of something weightless and insubstantial

Similar word(s): airiness

Definition categories: attribute, lightness, weightlessness

3. the tendency to float in water or other liquid

Definition categories: attribute, inclination, tendency

4. irrepressible liveliness and good spirit

- I admired his buoyancy and persistent good humor

Similar word(s): irrepressibility

Definition categories: attribute, life, liveliness, spirit, sprightliness