All 5 Uses

sanguine
in
Sense and Sensibility
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Mr. Dashwood's disappointment was, at first, severe; but his temper was cheerful and sanguine; and he might reasonably hope to live many years, and by living economically, lay by a considerable sum from the produce of an estate already large, and capable of almost immediate improvement.†
Chpt 1
In seasons of cheerfulness, no temper could be more cheerful than hers, or possess, in a greater degree, that sanguine expectation of happiness which is happiness itself.†
Chpt 2 *
Mr. Harris, who attended her every day, still talked boldly of a speedy recovery, and Miss Dashwood was equally sanguine; but the expectation of the others was by no means so cheerful.†
Chpt 43
Her sister, however, still sanguine, was willing to attribute the change to nothing more than the fatigue of having sat up to have her bed made; and carefully administering the cordials prescribed, saw her, with satisfaction, sink at last into a slumber, from which she expected the most beneficial effects.†
Chpt 43
To judge from the Colonel's spirits, however, you have not yet made him equally sanguine.†
Chpt 45

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.