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serious | concerned with work or important matters rather than play or trivialities | ||
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serious | requiring effort or concentration; complex and not easy to answer or solve | ||
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serious | of great consequence | ||
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serious, grave, dangerous, grievous, severe, life-threatening | causing fear or anxiety by threatening great harm | ||
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serious, good | appealing to the mind | ||
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sober, serious, unplayful | completely lacking in playfulness |