This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state of being cheerful; joy.

n. Good spirits; a state of moderate joy or gayety; alacrity.

n. The state or quality of being cheerful. A state of moderate joy or gaiety.

n. Alacrity; readiness; geniality.

n. Synonyms Mirth, Cheerfulness, etc. See mirth.

n. a feeling of spontaneous good spirits

n. the quality of being cheerful and dispelling gloom

"You assume, in your essay, that cheerfulness is a good thing."

depression    discouragement   

alacrity    geniality    hilarity    sunshine    gladsomeness   

cheer   

gaiety    calmness    gentleness    firmness    kindliness    vivacity    frankness    sincerity    friendliness    contentment