What is another word for serious?

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

Grave in manner or disposition
“He looked serious as he began the daunting task of doing his taxes.”
Of an important nature
“This is a serious matter which requires your immediate attention.”
Requiring considerable thought or reflection
“Please give some serious consideration to my request as it will really make a difference to me.”
Meriting deep reflection
“This is a serious film that explores the impacts of climate change.”
Significantly worrying in nature
“He suffered a serious leg injury after an accident while skateboarding.”
Having earnest intentions
“The president was serious when he claimed to be committed to improving the economy.”
Large in quantity
“Harland made serious amounts of money selling fried chicken in Kentucky.”
Not to be laughed at
“Stop laughing. This is serious!”
Not easily answered or solved
“We have some serious bugs in this computer program.”
(informal) Truly meaning something said that was outrageous in nature
“You want to go on a donut diet? Are you serious?”
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