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serious 
1  adj Serious problems or situations are very bad and cause people to be worried or afraid. 
Crime is an increasingly serious problem in Russian society...  
 seriously  adv 
If this ban was to come in it would seriously damage my business...  
 seriousness  n-uncount 
...the seriousness of the crisis.  
2  adj Serious matters are important and deserve careful and thoughtful consideration. 
I regard this as a serious matter...  
3  adj When important matters are dealt with in a serious way, they are given careful and thoughtful consideration. 
My parents never really faced up to my drug use in any serious way...  
 seriously  adv 
The management will have to think seriously about their positions.  
4  adj Serious music or literature requires concentration to understand or appreciate it. 
There is no point reviewing a blockbuster as you might review a serious novel.  
5  adj If someone is serious about something, they are sincere about what they are saying, doing, or intending to do. 
You really are serious about this, aren't you?...  
 seriously  adv 
Are you seriously jealous of Erica?  
 seriousness  n-uncount 
In all seriousness, there is nothing else I can do...  
6  adj Serious people are thoughtful and quiet, and do not laugh very often. 
He's quite a serious person...  
 seriously  adv 
They spoke to me very seriously but politely.