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buoyancy/buoyance

NOUN
lightness in weight
Synonyms
WEAK
airiness ethereality floatability levity weightlessness
Antonyms
WEAK
blues depression heaviness
NOUN
lightness in spirit
Synonyms
WEAK
animation bounce cheerfulness cheeriness ebullience effervescence exuberance gaiety good feeling good humor happiness high spirits jollity liveliness pep spiritedness sunniness vim and vigor zing zip
Antonyms
WEAK
blues depression heaviness

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.