buoyant
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adjective
1. able or apt to stay afloat or rise to the top of a liquid or gas.
浮力がある
(of a liquid or gas) able to keep something afloat:
〈液体が〉物を浮かせる, 揚力がある
e.g. buoyant water.
2. cheerful and optimistic:
〈気分が〉うきうきした; 〈人が〉立ち直りの早い, 楽天的な
e.g. the conference ended with the party in a buoyant mood.
3. (of an economy, business, or market) involving or engaged in much activity:
〈経済･株式市場などが〉上昇傾向にある
e.g. car sales were not buoyant.
DERIVATIVES
buoyantly |ˈboiəntlē, ˈbo͞oyəntlē| adverb
ORIGIN
late 16th century: from French bouyant or Spanish boyante, present participle of boyar ‘to float’ (see buoy).