What is the meaning of the word "mirthfulness"?

Definitions:

  1. A lighthearted feeling of happiness and amusement. copy to clipboard NOUN
    • She often brings mirthfulness to other with her bubbly personality and contagious laughter. copy to clipboard
  2. A mood characterized by high spirits and amusement and often accompanied by laughter. copy to clipboard NOUN
    • The mirthfulness of the revelers was contagious, and pretty soon everyone in the bar was laughing. copy to clipboard
  3. A state of joyful exuberance. copy to clipboard NOUN
    • At times he is taciturn and solemn, and then bubbles over with mirthfulness. copy to clipboard

Synonyms: