sanguine

adjective

• 1optimistic or positive, especially in an apparently bad or difficult situation:he is sanguine about prospects for the global economy the committee takes a more sanguine view
• (in medieval science and medicine) of or having the constitution associated with the predominance of blood among the bodily humours, supposedly marked by a ruddy complexion and an optimistic disposition.
• archaic (of the complexion) florid or ruddy.

• 2 literary & Heraldry blood-red.

• 3 archaic bloody or bloodthirsty.

noun

• a blood-red colour.
• a deep red-brown crayon or pencil containing iron oxide.
• Heraldry a blood-red stain used in blazoning.