She always laughs cheerfully.
彼は朗らかな声であいさつした。
He greeted us in a bright, cheerful voice.
Used descriptively for a bright, clear sky, day, or weather. This weather use is more literary or expressive than everyday phrases such as よく晴れた or 明るい.
朗らかな春の日に、家族で公園を歩いた。
On a bright spring day, we walked through the park as a family.
She has such a cheerful personality that everyone likes her.
He kept talking, laughing brightly all the while.
A cheerful, clear voice came from the other end of the phone.
Today the sky is bright and clear, perfect weather for an outing.