seriousness
nounUK /ˈsɪəriəsnəs/
US /ˈsɪriəsnəs/
Seriousness is when you are not joking and you mean what you say.
The teacher spoke with seriousness about the important test.
OTHER MEANINGS
2. The quality of being important or needing careful thought.
We understood the seriousness of the problem and asked for help.
3. A calm and quiet way of acting that shows you are not playing.
Her seriousness during the meeting surprised everyone.
4. The state of being dangerous or worrying.
The doctor explained the seriousness of the illness.