serious [ ser·i·ous ]
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Adjective
1. Demanding or characterized by careful consideration or application.
First though, there were serious problems that needed solving.
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2. Solemn or thoughtful in character or manner.
He looked so serious for a moment that Faith almost believed him.
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3. (of music, literature, or other art forms) requiring or meriting deep reflection.
They are probably the only group around making any kind of serious music.
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4. Acting or speaking sincerely and in earnest, rather than in a joking or half-hearted manner.
actors who are serious about their work
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5. Significant or worrying because of possible danger or risk; not slight or negligible.
she escaped serious injury
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6. Substantial in terms of size, number, or quality.
So, I am making a shopping list and plan to be spending some serious money!
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Origin
1. Late Middle English from Old French serieux or late Latin seriosus, from Latin serius ‘earnest, serious’.

