What is another word for serious?

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

Adjective
Grave in manner or disposition
“He looked serious as he began the daunting task of doing his taxes.”
Adjective
Of an important nature
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“This is a serious matter which requires your immediate attention.”
Adjective
Requiring considerable thought or reflection
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“Please give some serious consideration to my request as it will really make a difference to me.”
Adjective
Meriting 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
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“The president was serious when he claimed to be committed to improving the economy.”
Adjective
Large in quantity
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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
Causing great pain or anguish
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Adjective
Having a harsh or menacing demeanor or nature
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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
Of or belonging to the professional level of a sport, particularly baseball in the United States
Adjective
Without artificiality or insincerity
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Adjective
Having a calm and serious manner or disposition
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Adjective
Having a very gloomy or ill-tempered expression or demeanor
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Adjective
Spending a lot of time studying or reading
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Adjective
Having a somber or dismal atmosphere or nature
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Adjective
Following carefully and exactly a set of rules
Adjective
Causing or liable to cause death or tragedy
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Adjective
Very severe or serious
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Adjective
Used as an intensifier
Adjective
Liable
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Adjective
Intended for, or likely to be understood by, only a small number of people
Adjective
Not excessively showy or lively
Adjective
Affectedly proper or serious
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Adjective
Of, characterized by, or consisting of (incontrovertible) facts
Adjective
Conspicuously or obviously bad, wrong or offensive
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Adjective
Resembling or characteristic of an owl
Adjective
Very unusual or remarkable
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Adjective
Significantly large in size, amount, value or degree
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Adjective
Representing an exemplary standard within a traditional and long-established form or style
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Adjective
(of a person) Strictly conventional in one's manner or behavior