ultraserious

adjective

ul·​tra·​se·​ri·​ous ˌəl-trə-ˈsir-ē-əs 

: extremely serious: such as

a

: very thoughtful or subdued in appearance or manner

wearing an ultraserious expression

b

: having exceedingly important or dangerous consequences

an ultraserious problem/injury

also : involving or deserving an exceedingly large amount of thought, attention, or work

an ultraserious topic

c

: not joking or funny

her ultraserious tone/expression

d

: extremely interested or devoted

an ultraserious student

e

: exceedingly great or impressive in quality, quantity, extent, or degree

an ultraserious piece of equipment

Examples of ultraserious in a Sentence

Recent Examples on the Web

Huebel played the part as an ultraserious Jeff Probst type, standing by gravely as the moms took off their bikini tops and threw them in a fire pit when they were voted off the island. —Emily Yahr, Washington Post, 30 Jan. 2023

Word History

First Known Use

1851, in the meaning defined above