Sanguine

Optimistic or positive, especially in an apparently bad or difficult situation.

From Middle English sanguine, from Old French sanguin, ultimately from Latin sanguineus (“of blood”), from sanguis (“blood”) (of uncertain origin, but probably from Proto-Indo-European *h₁sh₂-én-, from *h₁ésh₂r̥ (“blood”), with an obscure suffix such as *-ǵʰ- (related to body parts)) +‎ -inus +‎ -eus. The obsolete medical sense is in reference to the humour (blood) which ancient Hippocratic and later Galenic medicine associated with cheerfulness, optimism, confidence, liveliness, and spiritedness. Doublet of sanguineous.

incarnadine