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What is another word for being serious?

Need synonyms for being serious? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Of an important nature
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“This is a serious matter which requires your immediate attention.”
Adjective
Grave in manner or disposition
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“He looked serious as he began the daunting task of doing his taxes.”
Adjective
Thoughtful in manner or disposition
“So, Drew and Otto left the fort, Drew carefully holding his wrapped bundle, and Otto looking serious and deep in thought.”
Adjective
Requiring considerable thought or reflection
“Please give some serious consideration to my request as it will really make a difference to me.”
Adjective
Meriting, or tending to provoke, deep reflection
“This is a serious film that explores the impacts of climate change.”
Adjective
Significantly worrying in nature
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“He suffered a serious leg injury after an accident while skateboarding.”
Adjective
Having earnest intentions
“The president was serious when he claimed to be committed to improving the economy.”
Adjective
Abundant or plentiful in quantity, amount or extent
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“Harland made serious amounts of money selling fried chicken in Kentucky.”
Adjective
Not to be laughed at
“Stop laughing. This is serious!”
Adjective
Not easily answered or solved
“We have some serious bugs in this computer program.”
Adjective
(informal) Truly meaning something said that was outrageous in nature
“You want to go on a donut diet? Are you serious?”
Adjective
Dangerous or full of peril
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Adjective
Marked by a likelihood to threaten the safety of a person or persons
Adjective
Interesting enough to be reported as a news
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Adjective
Requiring, or involving, great mental or physical effort
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Adjective
(of a literary work) Overly serious or difficult
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Adjective
Having a pedantic, scholarly manner, as of a college don
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Adjective
Without artificiality or insincerity
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Adjective
Having a calm and serious manner or disposition
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Adjective
Significant in degree of importance or urgency
Adjective
Following carefully and exactly a set of rules
Adjective
Determined to achieve something at all costs
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Adjective
Significantly large in size, amount, value or degree
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Adjective
Having the mournful, sombre character appropriate to a funeral
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Adjective
Causing or liable to cause death or tragedy
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Adjective
Used as an intensifier
Adjective
Intended for, or likely to be understood by, only a small number of people
Adjective
Having or indicating an efficient, practical, and systematic approach to one's work or a task
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Adjective
Not excessively showy or lively
Adjective
Affectedly proper or serious
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Adjective
Of, characterized by, or consisting of (incontrovertible) facts
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Adjective
Very unusual or remarkable
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Adjective
Hopeless, incapable of being cured (of some negative quality)
Adjective
Very pragmatic or realistic, lacking emotion or artificiality
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Adjective
(of a person) Strictly conventional in one's manner or behavior
Adjective
Describing offenses or actions subject to penalties, fines, or retributions
Adjective
(of a person) Making others work hard or meet high standards
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Adjective
Applying great effort or hard work to a given task or goal
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Interjection
Used to express shock, surprise or skepticism, or to indirectly request confirmation or more information
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