cheeriness

n.

高兴，爽快，活泼；

‘Extraordinary cheeriness and good will’
‘Extraordinary Cheeriness and Good Will’: The Uses and Documentation of First World War Slang
In London, Lots of Cheeriness But Little to Cheer About
The real reason for the Liberal Democrats' odd cheeriness: Ed Miliband is doing worse
A Kinder, Gentler Face for the IRS: Who Knew? Audits Are Down and Cheeriness Is Up at Tax Central
Colorful holiday cards add cheeriness to home
With the Return of Sun Comes Spring and Cheeriness
Cheeriness rankings amusing
Advertising distractor devaluation under perceptual and cognitive load
Wake Up, It's Spring!