Meaning : Being full of or promoting cheer. Having or showing good spirits.
Example :
Her cheerful nature.
A cheerful greeting.
A cheerful room.
As cheerful as anyone confined to a hospital bed could be.
Causing sad feelings of gloom and inadequacy.
The economic outlook is depressing.Meaning : Pleasantly (even unrealistically) optimistic.
Synonyms : pollyannaish, upbeat