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English definition of “buoyant”

buoyant

adjective uk   /ˈbɔɪ.ənt/ us  

buoyant adjective (FLOATING)

able to float: Cork is light and buoyant.Staying afloat, capsizing and sinking

buoyant adjective (HAPPY)

happy and confident: After reading the letter he was in a buoyant mood.Satisfied and complacentShowing arrogance and conceitConfidence and self-assurance

buoyant adjective (SUCCESSFUL)

successful or making a profit: The housing market remains buoyant.Profits and lossesSuccessful (things or people)
buoyancy
noun [U] uk   /ˈbɔɪ.ən.si/ us  
We tested the boat for buoyancy. He was a man of remarkable buoyancy (= able to stay positive despite problems).Excitement, interest, energy and enthusiasmStaying afloat, capsizing and sinkingProfits and lossesSuccessful (things or people)
buoyantly
adverb uk   /-li/ us  
Staying afloat, capsizing and sinkingExcitement, interest, energy and enthusiasm
(Definition of buoyant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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