optimiste
An optimiste is a person who tends to have positive expectations for the future and to interpret events in a favorable light. In English, the corresponding term is optimist, and the noun is optimism; in French, optimiste describes the person and optimisme describes the attitude.
Philosophical sense and history: Philosophical optimism is the view that life, existence, or the world is good
Psychology and social science: In psychology, optimism is studied as a dispositional trait or cognitive style.