Englishfor English speakers
serious
Adjective
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A problem or situation is serious if it is not funny or comical, but important.
This is a serious problem. We must do something.
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A person is serious if the person is not laughing or joking, but saying what they mean.
I see. When you said the room was empty, you were serious!
The woman's face looked serious, so I knew she was saying something important.
reflection
Noun
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A reflection is an image made by reflected light, such as what you see in a mirror.
The baby tried to touch his reflection in the water.
Narcissus fell in love with his own reflection.
A mirage is a reflection of the sky that looks like water in the desert.\
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Reflection is remembering.
After his loss he spent a lot of time in reflection.