腦囟都未生埋
nou5 seon2 dou1 mei6 saang1 maai4nǎo xìn dōu wèi shēng máiinferred
English
- childish, immature; literally, the soft spot (on the head) has not closed
粵語 — Cantonese
- 腦囟本身都應該一兩歲就埋口，用嚟形容人好似BB仔咁幼稚、唔成熟
Examples
成二十歲人腦囟都未生埋，人哋講佢就信。
He's twenty but still childish; he believes everything others say.
Sources: rime-cantonese, synthesized, words.hk