buoyancy
definition: irrepressible liveliness and good spirit
example: I admired their buoyancy and persistent good humor.
speech part: noun
synonyms:
irrepressibility
definition: the tendency to float in water or other liquid
example:
speech part: noun
synonyms:
definition: the property of something weightless and insubstantial
example:
speech part: noun
synonyms:
airiness
definition: cheerfulness that bubbles to the surface
example:
speech part: noun
synonyms:
perkiness