cheerfully optimistic, hopeful, or confident: a sanguine disposition; sanguine expectations.
reddish; ruddy: a sanguine complexion.
(in old physiology) having blood as the predominating humor and consequently being ruddy-faced, cheerful, etc.
bloody; sanguinary.
blood-red; red.
Heraldry. a reddish-purple tincture.
a red iron-oxide crayon used in making drawings.

1275–1325; Middle English sanguyne a blood-red cloth < Old French sanguin < Latin sanguineus bloody, equivalent to sanguin-, stem of sanguis blood + -eus -eous

sanguinely, adverb
sanguinity, sanguinness, noun
nonsanguine, adjective
nonsanguinely, adverb
nonsanguineness, noun
oversanguine, adjective
oversanguinely, adverb
oversanguineness, noun
presanguine, adjective
quasi-sanguine, adjective
quasi-sanguinely, adverb
supersanguine, adjective
supersanguinity, noun
unsanguine, adjective
unsanguinely, adverb

sanguinary, sanguine.

1. enthusiastic, buoyant, animated, lively, spirited.

1. morose. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sanguine (ˈsæŋɡwɪn)
1.  cheerful and confident; optimistic
2.  (esp of the complexion) ruddy in appearance
3.  blood-red
4.  an obsolete word for sanguinary
5.  Also called: red chalk a red pencil containing ferric oxide, used in drawing
[C14: from Latin sanguineus bloody, from sanguis blood]

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

1319, "type of red cloth," from O.Fr. sanguin (fem. sanguine), from L. sanguineus "of blood," also "bloody, bloodthirsty," from sanguis (gen. sanguinis) "blood" (see sanguinary). Meaning "blood-red" is recorded from 1382. Meaning "cheerful, hopeful, confident" first attested
1509, since these qualities were thought in medieval physiology to spring from an excess of blood as one of the four humors.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sanguine san·guine (sāng'gwĭn)

  1. Of a healthy, reddish color; ruddy.

  2. Cheerfully confident; optimistic.

  3. Having blood as the dominant humor in terms of medieval physiology.

  4. Archaic Having the temperament and ruddy complexion that was formerly thought to be characteristic of a person dominated by this humor; passionate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


chalk or crayon drawing done in a blood-red, reddish, or flesh colouring. The pigment employed is usually a chalk or clay containing some form of iron oxide. Sanguine was used extensively by 15th- and 16th-century artists such as Leonardo da Vinci (who employed it in his sketches for the Last Supper), Michelangelo, Raphael, and Andrea del Sarto.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
First, he's genuinely optimistic the economy will be okay, in part because he's
  sanguine about the expiration of fiscal stimulus.
He makes it anyway, with exacting standards but a sanguine hand.
The engineering became more exacting as the songs became vaguer and the voices
  less sanguine.
World markets have, up to this point, been relatively sanguine.
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