buoyancy

noun

irrepressible liveliness and good spirit
元気と上機嫌を抑えきれない
- I admired his buoyancy and persistent good humor
  私は彼の陽気で変わらない上機嫌に感心した
the tendency to float in water or other liquid
水またはほかの液体に浮かぶ傾向
the property of something weightless and insubstantial
無重力で実質がないものの特性
cheerfulness that bubbles to the surface
表面に弾け出るような快活さ

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