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over-seriousness
over-seriousness n.
Brit. 
/ˌəʊvəˈsɪərɪəsnəs/
, /ˌəʊvəˈsɪərɪəsnəs/U.S. /ˌoʊvərˈsɪriəsnəs/
/ˌoʊvərˈsɪriəsnəs/ΚΠ
1709 Ld. Shaftesbury Moralists i. iii. 29 Your Over-seriousness..may have driven me perhaps into a contrary Extreme, by opposition to your melancholy Humour.
1987 Amer. Q. 39 522 For all its possible overseriousness, it was, in intention at least, for the period unusually tough-minded and self-critical.
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