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serious [ ser·i·ous ]

[
US
ˈsɪriəs ]
[
UK
ˈsɪəriəs ]
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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’.

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