Wiktionary
cheerfullest
a. (en-superlative of: cheerful)
Usage examples of "cheerfullest".
The cheerfullest thing I could think of to say was: `But he didn't leave you.
Hepzibah's small and ancient table, supported on its slender and graceful legs, and covered with a cloth of the richest damask, looked worthy to be the scene and center of one of the cheerfullest of parties.
Again I thanked him and apologized, and again he said in the cheerfullest manner, “Not at all, I am sure!
He had evidently lived in varied cities and very motley societies, for some of his cheerfullest stories were about gambling hells and opium dens, Australian bushrangers or Italian brigands.