腦nou5囟seon2未mei6生saang1埋maai4

simp脑囟未生埋

nou5 seon2 mei6 saang1 maai4nǎo xìn wèi shēng mái

English

(literally: one's fontanelles are not closed); immature; childish
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: cc-canto, rime-cantonese, words.hk

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