Showing results for most serious. Search instead for most+serous.

most serious

ADJECTIVE

somber, humorless

Synonyms

STRONGEST

deliberate genuine honest severe sincere thoughtful

STRONG

sober

WEAK

austere bound bound and determined businesslike cold sober contemplative deadpan determined downbeat earnest funereal go for broke grave grim intent long-faced meditative no-nonsense pensive pokerfaced reflective resolute resolved sedate set solemn staid steady stern unhumorous unsmiling weighty

Antonyms

STRONGEST

deceptive dishonest false insincere misleading untrustworthy

WEAK

flippant funny happy light minor trivial unimportant unserious

ADJECTIVE

crucial, weighty

Synonyms

STRONGEST

dangerous deep difficult far-reaching grievous important major meaningful severe significant tough urgent

WEAK

arduous fateful fell formidable grave grim hard heavy laborious meaning business menacing momentous no joke no laughing matter of consequence operose out for blood playing hard ball pressing smoking sobering strenuous strictly business threatening ugly unamusing unhumorous worrying

Antonyms

STRONGEST

calm easy facile friendly insignificant little meaningless minor small trivial unimportant worthless

WEAK

flippant funny happy light unserious

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

New research in mice suggests that gut microbes and the compounds they produce may play a surprising role in protecting against some of the condition's most serious consequences, including heart disease.

From Science Daily • Jun. 9, 2026

It is the most serious incident of its kind in this country since Russia's full-scale invasion began in 2022.

From BBC • May 30, 2026

In his letter, Andic said the "deeply painful" death of his father had been made worse by having to deal with "the most serious, unjust and unfounded accusation a person can face".

From Barron's • May 26, 2026

Phillips, a nondescript and mostly unknown Minnesota congressman, was the most serious protest vote option.

From Slate • May 26, 2026

Meant to hold those convicted of the most serious crimes, it has long been considered the most dangerous, most hopeless prison in the United States.

From "Zeitoun" by Dave Eggers