Definition of "sanguine" [san•guine]

• Of the color of blood; red. (adjective)
• Of a healthy reddish color; ruddy: a sanguine complexion. (adjective)
• Archaic Having blood as the dominant humor in terms of medieval physiology. (adjective)
• Archaic Having the temperament and ruddy complexion formerly thought to be characteristic of a person dominated by this humor; passionate. (adjective)
• Cheerfully confident; optimistic. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Will they remain sanguine when excess reserves increase to $2 trillion?"
• "If you're not familiar with these terms a sanguine is a naturally outgoing personality who can hold three conversations at once, doesn't like to be alone, is the life of every party and is often said to be a people person."
• "One temperament is commonly called sanguine, meaning, literally, “from the blood.”"