Definition of overserious
: unduly or excessively serious
an overserious person had an overserious expression on her face The story sometimes edges toward soapy melodrama but saves itself from becoming overserious with cheeky humor … — PublishersWeekly.com
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Merriam-Webster unabridged
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Time Traveler for overserious
The first known use of overserious was in 1622
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