Optimistic and confident, especially in difficult situations; cheerfully hopeful about future outcomes. Can also mean having a healthy reddish complexion.
From Latin 'sanguineus' meaning 'of blood,' from 'sanguis' (blood). In medieval medicine, a sanguine temperament was associated with having an abundance of blood, which supposedly made people cheerful, confident, and ruddy-complexioned.
Think 'sanguine' = 'bloody optimistic'! Medieval doctors thought people with lots of blood were naturally cheerful. Even today, we associate rosy cheeks with good health and happiness.
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