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over-childish
over-childish adj.
Brit. 
/ˌəʊvəˈtʃʌɪldɪʃ/
, /ˌəʊvəˈtʃʌɪldɪʃ/U.S. /ˌoʊvərˈtʃaɪldɪʃ/
/ˌoʊvərˈtʃaɪldɪʃ/ΚΠ
1904 N.E.D. at Over- Over-childish.
1957 E. J. Lovell in C. D. Thorpe et al. Major Eng. Romantic Poets 141 The overchildish or over pretty or feminine element in some good Wordsworth and in much poetry up to our date.
1988 Financial Times (Nexis) 8 Mar. 21 The sometimes over-childish moments of her early trivialities and excesses.
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