Something that is joyful causes happiness and pleasure.
A wedding is a joyful celebration of love.
婚礼是令人喜悦的爱情庆典。
Someone who is joyful is extremely happy.
We're a very joyful people; we're very musical people and we love music.
我们是非常快乐的民族;我们是擅长音乐的民族,我们热爱音乐。