All 3 Uses

sanguine
in
Wuthering Heights
(Auto-generated)

and hour after hour he would sit beside her, tracing the gradual return to bodily health, and flattering his too sanguine hopes with the illusion that her mind would settle back to its right balance also, and she would soon be entirely her former self.†
p. 97.6
Catherine ran wild with joy at the idea of welcoming her father back; and indulged most sanguine anticipations of the innumerable excellencies of her 'real' cousin.†
p. 144.9
but that's worse than I expected — and the devil knows I was not sanguine!'†
p. 150.9 *

Definitions:

(1) (sanguine)
confidently optimistic
(2) (meaning too rare to warrant focus)
Other meanings of sanguine relate to its root meaning of blood. Thus sanguine or rare derivatives like sanguinary or sanguineous can refer to the color red or to bloodshed.