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non-serious
non-serious adj.
Brit. 
/(ˌ)nɒnˈsɪərɪəs/
, /(ˌ)nɒnˈsɪərɪəs/U.S. /ˌnɑnˈsɪriəs/
rare before 20th cent./ˌnɑnˈsɪriəs/ΚΠ
1822 C. Lamb in London Mag. Mar. 282/1 In the latter [sc. puns], I include all non-serious subjects.
1939 Social Forces 17 368/2 Drunkenness, begging, vagrancy, similar misdemeanors were listed as non-serious.
1992 Mind 101 10 One should treat not-p as a non-serious possibility in a certain decision context..only if one adds p to the corpus of propositions.
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