The sanguine ‘complexion’ or temperament.

toujours gai/ɡe/, ‘always cheerful’; cheerful under all circumstances; also as n., an unfailingly cheerful disposition. Occasionally partially…

Hopefulness and confidence about the future or the successful outcome of something; a tendency to take a favourable or hopeful view. Contrasted with…

figurative. Elasticity of spirit, lightheartedness; capacity for recovering after depression.

= buoyancy, n. (poetic or rhetorical.)

Psychology. In the factorial analysis of personality: a factor which predisposes a person towards light-heartedness and freedom from worry; (hence)…