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)
English Collins Dictionary - English Definition & Thesaurus
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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"