老懵懂
lou5 mung2 dung2lǎo měng dǒng
English
- describes an old person who has a bad memory; a dotard
- (derogatory) a person who is old and stupid
粵語 — Cantonese
- 年紀大、精神差、智力下降嘅人；略帶侮辱成份（量詞：個）
Examples
阿爺年紀雖然大，但係唔係老懵懂，你唔好呃佢啊！
Although Grandpa is old, he is not old and stupid, don't try to cheat him!
Sources: cc-canto, rime-cantonese, words.hk