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serious 
  adj 
1 grave in nature or disposition; thoughtful 
a serious person  
2 marked by deep feeling; in earnest; sincere 
is he serious or joking?  
3 concerned with important matters 
a serious conversation  
4 requiring effort or concentration 
a serious book  
5 giving rise to fear or anxiety; critical 
a serious illness  
6 Informal worthy of regard because of substantial quantity or quality 
serious money, serious wine  
7 Informal extreme or remarkable 
a serious haircut  
  (C15: from Late Latin seriosus, from Latin serius; probably related to Old English swær gloomy, Gothic swers esteemed) 
♦  seriousness  n 

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"