cheerful and openhearted
Describes a personality that is bright, frank, and free from gloom or hidden feelings. Often used to characterize someone's disposition or atmosphere.
He has a cheerful and openhearted personality, and can quickly become friends with anyone.
明朗快活に振る舞うことで、周りの雰囲気も明るくなる。
By behaving in a cheerful and openhearted manner, you can brighten the atmosphere around you.
Means 'bright and clear' and can refer to personality or atmosphere, but lacks the 'openhearted' nuance of 快活.
Means 'lively and cheerful,' emphasizing energy and vivacity, while 明朗快活 adds the sense of frankness and openness.
A yojijukugo combining 明朗 (bright, clear) and 快活 (cheerful, lively). The exact historical derivation is uncertain, but the compound is conventionally associated with a cheerful and openhearted disposition.