Mirthful(adjective)
Full of merriment, laughter, or joy; cheerful. (??????, ????????????)
Synonyms: Joyful, Gleeful, Merry, Cheerful
Antonyms: Sad, Gloomy, Sorrowful, Depressed
Example: The mirthful laughter of the children filled the park.
Trick to remember: Jahan mirthful log hote hain, wahan hamesha mirth (masti) hoti hai! 
