[uncountable] great happiness (Oxford)
[uncountable] the quality of being well chosen or suitable (Oxford)
happiness, luck, or a condition that produces positive results (Cambridge)
The story is told with great felicity of style. (Oxford)
Her book displays many subtle linguistic felicities. (Oxford)
He is enjoying dubious felicity of marriage. (Cambridge)
great felicity of style.
subtle linguistic felicities.
felicity of marriage
Bliss
Cheerfulness
Depression
Sispleasure
Felicitously
Felicitous