childish
Concise Oxford English Dictionary © 2008 Oxford University Press:
childish/ˈtʃʌɪldɪʃ/
▶adjective of, like, or appropriate to a child.
■ silly and immature.
– derivatives
childishly adverb,
childishness noun.
childishly adverb,
childishness noun.
'childish' also found in these Oxford entries:

