人心隔肚皮
jan4 sam1 gaak3 tou5 pei4rén xīn gé dù pí
English
- there is no knowing what is in a man's heart (idiom)
- cannot judge one is a good person by its look (slang)
- cannot judge whether a person is good by the look; literally: a person's heart is separate from the skin of the belly
粵語 — Cantonese
- 唔可以單憑表面而判斷某個人係咪真係好人
Examples
人心隔肚皮，人哋呃緊你都未定啊。
You really can't tell whether that guy is a good person by his look. He might be deceiving you.
Sources: cc-canto, cc-cedict, rime-cantonese, words.hk