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Definition of serious

serious

/ˈsɪr.i.əs/
se · ri · ous

Adverb:seriously
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serious Lexical Profile

serious Game Scores & Validity

• adjective

1

Significant, severe, or worrying because of possible danger, harm, or unfavorable consequences; demanding careful consideration or urgent action.

Example

"The environmental committee met to address the serious decline in local honeybee populations."


2

Thoughtful, solemn, and subdued in manner, character, or appearance; not given to lightheartedness or joking.

Example

"He maintained a serious expression throughout the entire courtroom testimony."


3

Acting or speaking sincerely and in earnest, rather than joking, pretending, or being superficial.

Example

"She made a serious offer to purchase the historic bookstore before it closed."


4

Requiring deep thought, intellectual effort, or aesthetic appreciation; having high artistic, scholarly, or professional standards rather than being intended merely for casual entertainment.

Example

"The journal publishes serious scholarship on ancient Mediterranean history."


5

Substantial or impressive in size, amount, degree, or quality (often used informally).

Example

"Restoring the nineteenth-century farmhouse will require some serious time and financial investment."

Synonyms
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Antonyms
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• Rhymes for serious

Word Origin & Etymology

Borrowed in the mid-15th century from Middle French serieux or directly from Late Latin seriosus, derived from Latin serius meaning 'weighty, grave, or earnest,' which is ultimately related to a Germanic root meaning 'heavy' or 'slow.'

Cite this Entry


Wordmom. (2026). Definition of Serious. In Wordmom Dictionary. Retrieved Oct 31, 2026, from https://wordmom.com/dictionary/serious
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