Buoyant

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Buoyant

(v. t. & i.) Having the quality of rising or floating in a fluid; tending to rise or float; as, iron is buoyant in mercury.
(v. t. & i.) Bearing up, as a fluid; sustaining another body by being specifically heavier.
(v. t. & i.) Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits.