All 3 Uses

sanguine
in
The Canterbury Tales
(Auto-generated)

Of his complexion he was sanguine.†
Chpt 1.0 *
In sanguine* and in perse** he clad was all *red **blue
Lined with taffeta, and with sendall*.†
Chpt 1.0
His nose was high, his eyen bright citrine*, *pale yellow
His lips were round, his colour was sanguine,
A fewe fracknes* in his face y-sprent**, *freckles **sprinkled
Betwixte yellow and black somedeal y-ment* *mixed <59>
And as a lion he *his looking cast* *cast about his eyes*
Of five and twenty year his age I cast* *reckon
His beard was well begunnen for to spring;
His voice was as a trumpet thundering.†
Chpt 1.1

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.