Adjective cheerful has 2 senses
- cheerful - being full of or promoting cheer; having or showing good spirits; "her cheerful nature"; "a cheerful greeting"; "a cheerful room"; "as cheerful as anyone confined to a hospital bed could be"
Antonyms: cheerless, uncheerful, blue, dark, depressing, disconsolate, dispiriting, grim, dingy, dismal, drab, drear, dreary, gloomy, sorry, somber, sombre
- cheerful, pollyannaish, upbeat - pleasantly (even unrealistically) optimistic
Antonym: pessimistic (indirect, via optimistic)