serious : Idioms & Phrases
serious music
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noun traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste
classical music; classical.
WordNet
serious-minded
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adjective satellite acting with or showing thought and good sense
thoughtful.
- a sensible young man
WordNet
serious-mindedness
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noun the trait of being serious
seriousness; earnestness; sincerity.
- a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice