buoyant

形容词 buoyant:

1. tending to float on a liquid or rise in air or gas
   同义词：floaty
2. characterized by liveliness and lightheartedness
   同义词：chirpy, perky

1. In a buoyant mood.
   轻松的心情
2. The raft would be more buoyant if it was less heavy.
   木筏若轻一点浮起的就更好了。
3. Salt water is more buoyant than fresh water.
   盐水比淡水浮力大。

buoy.ant

adj.（形容词）
Having or marked by buoyancy:
有浮力的：有浮力的，显示浮力的：
例句：
a buoyant balloon; buoyant spirits.
一个漂浮起来的气球；高涨的情绪

Lighthearted; gay:
轻松的，轻快的；活泼的：
例句：
in a buoyant mood.
轻松的心情

来源：
Spanish boyante [present participle of] boyar [to refloat a boat]
西班牙语 boyante [] boyar的现在分词 [使船再次浮起]
from boya [buoy]
源自 boya [浮标]
from Old French boue * see buoy
源自 古法语 boue *参见 buoy

【引伸】
buoy.antly
adv.（副词）