gladness       
noun [ U ] uk/ˈɡlæd.nəs/ us/ˈɡlæd.nəs/
 快乐,愉快,高兴
the quality of being glad (= pleased and happy)
  Their hearts were filled with joy and gladness. 他们的心中充满了欢乐和喜悦。 
 She felt a rush of real and genuine gladness as she looked into her father's face. 看着父亲的脸,她感到一阵真正的、发自内心的喜悦。 
 See: glad
 - More examples
 - She was filled with such gladness that she wanted to scream out in joy.
 - He feels a sense of relief and gladness that he has been able to forget all about it.
 - My heart felt such gladness as she sat up, smiling at me.