"幼稚"在英语中可以用"immature"来表示。
"Immature"来源于拉丁语"immaturus"，意思是"未成熟的"。
例句：
His behavior is quite immature for a man of his age. (他这个年龄的人行为显得相当幼稚。)
She was criticized for being emotionally immature. (她因情绪不成熟而受到批评。)
He had an immature attitude towards pfe. (他对生活态度幼稚。)