seriousness

adjective

1. of, showing, having, or caused by earnestness or deep thought; earnest, grave, sober, or solemn: a serious person
2. 1. meaning what one says or does; not joking or trifling; sincere
   2. meant in earnestness; not said or done in play
3. concerned with grave, important, or complex matters, problems, etc.; weighty: a serious novel
4. requiring careful consideration or thought; involving difficulty, effort, or considered action: a serious problem
5. giving cause for concern; dangerous: a serious wound