san·guine adjective \ˈsaŋ-gwən\: confident and hopeful.
1: bloodred. 2 a: consisting of or relating to blood. b: bloodthirsty, sanguinary c. of the complexion: ruddy. 3: having blood as the predominating bodily humor; also: having the bodily conformation and temperament held characteristic of such predominance and marked by sturdiness, high color, and cheerfulness. 4: confident, optimistic.
Definition source: http://www.merriam-webster.com
The Word of the Day started with this post.