buoyancy (n.)cheerfulness that bubbles to the surface;
Synonyms: perkiness
buoyancy (n.)the property of something weightless and insubstantial;
Synonyms: airiness
buoyancy (n.)the tendency to float in water or other liquid;
buoyancy (n.)irrepressible liveliness and good spirit;
I admired his buoyancy and persistent good humor
Synonyms: irrepressibility
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