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say it: SIR-ee-uhs
serious is an adjective meaning "concerned with work or important matters rather than play or trivialities". It carries 6 recorded senses.
concerned with work or important matters rather than play or trivialities
“a serious student of history”
“a serious attempt to learn to ski”
“gave me a serious look”
“a serious young man”
“are you serious or joking?”
“Don't be so serious!”
requiring effort or concentration; complex and not easy to answer or solve
“raised serious objections to the proposal”
“the plan has a serious flaw”
Definitions, synonyms and semantic relations for serious come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.