What is the meaning of the word "seriousness"?

Definitions:

  1. the quality of arousing fear or distress copy to clipboard noun
    • They learned the seriousness of my illness when they arrived at my home unannounced. copy to clipboard
  2. the trait of being serious copy to clipboard noun
    • a lack of solemnity is not necessarily a lack of seriousness Robert Rice copy to clipboard

Synonyms: