The term 'most cheerful' can be described by three crossword solutions: rosiest (7 letters), perkiest (8 letters), and gayest (6 letters). Rosiest is an adjective that means having a healthy, pinkish complexion. Perkiest is an adjective that means full of energy and enthusiasm. Gayest is an adjective that means bright and lively in color or mood. All three words describe someone who is cheerful and happy.