This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or suitable for a child or childhood: a high, childish voice; childish nightmares.

adj. Marked by or indicating a lack of maturity; puerile: tired of your childish pranks.

adj. Not complicated; simple.

adj. Affected mentally by old age; senile.

adj. Of or suitable for a child.

adj. Behaving immaturely.

adj. Of, pertaining to, befitting, or resembling, a child.

adj. Puerile; trifling; weak.

Of or belonging to a child or to childhood: as, “sweet childish days,” Wordsworth, To a Butterfly.

Like or characteristic of a child or what is peculiar to childhood; especially, in disparaging use, trifling, puerile, silly, weak, etc.: as, childish amusements; childish fear.

Synonyms Childlike, Infantile, etc. See childlike.

adj. indicating a lack of maturity

"Marco Reininger, a veteran and political science major at Columbia, wrote on The Huffington Post that, despite what he called the childish catcalls that greeted Maschek, the institution as a whole is neither as elitist nor as condescending as the media firestorm suggests."

immature   

manly    womanly    womanish    old   

babyish   

childlike   

puerile    trifling    weak    childlike    childly    juvenile    youthful    brattish    kiddish    boyish   

boyish    foolish    passionate    childlike    innocent    pathetic    trivial    vulgar