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Serious

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Definition

serious: grave, dangerous, threatening, severe; formal
adjective
Icarus is a very serious person, he rarely laughs and he works very hard.
This problem is very serious and I want it fixed immediately!
This is a serious affair, so please be on your best behavior.
I'm dead serious! I'm completely, entirely, totally serious!

seriously: not jokingly, frankly; gravely, menacingly
adverb

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