单词	ultraserious
释义	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 Word History First Known Use 1851, in the meaning defined above
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