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Jyutping ngong6 ngoi4
Pinyin gàng dāi

Definitions (Wiktionary)
  1. noun, Hokkien, Mainland-China
    idiot; fool; stupid person
    (syn.) 愚人, 大戇呆, 戇大豬, 豆渣腦殼, 錘哥, 蠢材, 蠢人, 蠢蛋, 低能兒, 笨货, 呆瓜, 老衬, 呆子, 哈卵, 戆人, 戇人, 大番薯, 白痴, 戆大猪, 戆囝, 壋將, 大戇牯, 闇雞, 鵝牯, 老襯, 傻瓜, 笨貨, 戇鳩, 大戆呆, 低能儿, 鹅牯, 人头猪脑, 戇猴, 豆渣脑壳, 傻子, 笨人, 戆猴, 戇囝, 锤哥, 𬮴鸡, 大戆牯, 戆鸠, 戆大呆, 笨蛋, 人頭豬腦, 戇大呆, 垱将
  2. adj, Hokkien, Singapore, Taiwan
    stupid; foolish