The term 'confidently optimistic and cheerful' can be summarized by the three crossword solutions: SANGUINE (8 letters), UPBEAT (6 letters), and SUNNY (5 letters). SANGUINE is derived from the Latin word for 'BLOOD, ' and it is used to describe someone who is confident, hopeful, and cheerful. UPBEAT is a synonym for cheerful and optimistic, and it is often used to describe a positive attitude or outlook. SUNNY is a metaphor for cheerfulness, and it is often used to describe someone who is always in a good mood. Together, these three words provide an accurate description of someone who is confidently optimistic and cheerful.