ultraserious

adjective
ul·​tra·​se·​ri·​ous | \ ˌəl-trə-ˈsir-ē-əs How to pronounce ultraserious (audio) \

Definition of ultraserious

: 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

First Known Use of ultraserious

1851, in the meaning defined above

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The first known use of ultraserious was in 1851

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