[boi-uhnt, boo-yuhnt]
tending to float in a fluid.
capable of keeping a body afloat, as a liquid.
not easily depressed; cheerful.
cheering or invigorating.

1570–80; buoy + -ant

buoyantly, adverb
nonbuoyant, adjective
nonbuoyantly, adverb
unbuoyant, adjective
unbuoyantly, adverb

3. happy, lighthearted, breezy, jaunty, sunny.
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World English Dictionary
buoyant (ˈbɔɪənt)
1.  able to float in or rise to the surface of a liquid
2.  (of a liquid or gas) able to keep a body afloat or cause it to rise
3.  cheerful or resilient
[C16: probably from Spanish boyante, from boyar to float, from boya buoy, ultimately of Germanic origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570s, perhaps from Sp. boyante, prp. of boyar "to float," from boya "buoy," from Du. boei (see buoy). Of personalities, etc., from c.1748.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But continental crust is too light and buoyant to be subducted.
The heady economy, buoyant stock market and high-tech boom have created a surge
  in sudden wealth.
I've found that every time I've made a radical change, it's helped me feel
  buoyant as an artist.
The hot air is buoyant, so it quickly rises and expands.
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