► 形容詞
子供っぽい [(5)こどもっぽい] meaning: childish rank: 2
☆ 彼女は15才なのに未だに子供っぽい ⇨ She is 15 but still like a child
大人気無い [(5)おとなげない] meaning: childish rank: 3
☆ そんな程度のことで怒るなんて大人気無いんじゃない？ ⇨ Isn’t it childish to get angry over something like that? (☛ Unbecoming of an adult)
► 形容動詞
幼稚 [ようち] meaning: childish rank: 2
☆ 彼の幼稚な議論には馬鹿らしくなる ⇨ I get tired of his childish arguments