1.cheerfully optimistic, hopeful, or confident
2.reddish; ruddy: a sanguine complexion.
3.a red iron-oxide crayon used in making drawings.
"It was possible, however, that some of his companions in the ----shire might be able to give more information; and though she was not very sanguine in expecting it, the application was a something to look forward to"- Pride and Prejudice, Jane Austen
There is an paragraph or two that explains how the word came to have two different meanings it's long but I will put it up if anyone wants it.