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unserious

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adjective un·se·ri·ous \ˌən-ˈsir-ē-əs\

Definition of unserious

  1. :  not serious unserious writers unserious debates … recognize the difference between serious and unserious warnings. — Meg Greenfield

unseriously

adverb talking unseriously

unseriousness

noun

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1655

First Known Use of unserious

1655

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