“Childish person” in Japanese
Short answer
Childish person in Japanese is “ねんね” (nenne). Full meaning: going bye-byes, going beddy-byes, sleeping; baby; childish person (esp. a young woman).
Other ways to say “Childish person” in Japanese
お子ちゃま
okochama child; childish person, immature person
ネンネ
nenne going bye-byes, going beddy-byes, sleeping; baby; childish person (esp. a young woman)
寝んね
nenne going bye-byes, going beddy-byes, sleeping; baby; childish person (esp. a young woman)
Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.