Definitions

unserious

[uhn-seer-ee-uhs] / ˌʌnˈsɪər i əs /

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not solemn, not earnest adj.
not weighty, not important adj.

ADJECTIVE

not solemn, not earnest

Synonyms

STRONGEST

casual cavalier facetious flip flippant fun-loving in jest jesting larking light-hearted merry playful teasing tongue-in-cheek

STRONG

bantering clowning comic comical fooling funny grinning hilarious humorous jocular joking kidding light rollicking smirking

WEAK

amusing jolly laughable mocking nonsensical ridiculous

Antonyms

STRONGEST

earnest grave grim humorless long-faced pensive poker-faced reflective serious sincere sober solemn thoughtful unsmiling

STRONG

austere deadpan genuine intense sedate severe staid stern

WEAK

businesslike deliberate matter-of-fact

ADJECTIVE

not weighty, not important

Synonyms

STRONGEST

inconsequential insignificant minor negligible of no account paltry petty shrugworthy slight trifling trivial unimportant

STRONG

facile frivolous ignorable immaterial light little measly piddly small superficial

WEAK

commonplace everyday laughable risible

Antonyms

STRONGEST

consequential dire grave grievous heavy important life-and-death major momentous monumental significant unignorable weighty

STRONG

considerable critical crucial key meaningful ominous paramount portentous substantial

WEAK

complex huge massive onerous

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.

See Examples For:

unserious

Is there any risk that law firms with new, sans-serif mononyms will bend too far toward DTC branding tropes and strike some as unserious?

From The Wall Street Journal ● Oct. 14, 2026

It culminates in a deeply unserious fight scene where everyone is very obviously not throwing punches.

From Slate ● Sep. 26, 2026

Tucked against the arugula, they function almost like an extremely unserious vinaigrette.

From Salon ● Jul. 30, 2026

"Anybody who saw Alan in the Traitors knows he's completely unserious," she says.

From BBC ● Mar. 27, 2026

There seemed to me something sadly unserious about the militancy.

From "Hunger of Memory" by Richard Rodriguez

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