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buoyant

[boi-uh nt, boo-yuh nt] /ˈbɔɪ ənt, ˈbu yənt/
adjective
1.
tending to float in a fluid.
2.
capable of keeping a body afloat, as a liquid.
3.
not easily depressed; cheerful.
4.
cheering or invigorating.
Origin
1570-1580
1570-80; buoy + -ant
Related forms
buoyantly, adverb
nonbuoyant, adjective
nonbuoyantly, adverb
unbuoyant, adjective
unbuoyantly, adverb
Synonyms
3. happy, lighthearted, breezy, jaunty, sunny.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un-buoyant

buoyant

/ˈbɔɪənt/
adjective
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
Word Origin
C16: probably from Spanish boyante, from boyar to float, from boya buoy, ultimately of Germanic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un-buoyant

buoyant

adj.

1570s, perhaps from Spanish boyante, present participle of boyar "to float," from boya "buoy," from Dutch boei (see buoy (n.)). Of personalities, etc., from c.1748. Related: Buoyantly.

Online Etymology Dictionary, © 2010 Douglas Harper
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