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Jyutping wai4 mat1
Pinyin wèi miē

Definitions (Wiktionary)
  1. adv, Cantonese
    why
    (syn.) 擁啥, 做麼子, 為乜為物, 幾解, 作個乜, 做咋個, 何, 做啥子, 擁什麼, 蔣其, 作乜物, 為乜底, 為哪門, 為哪樣, 幹麼兒, 何解, 做孰事, 為咋哩, 因乜解究, 嗎介, 曷, 為啥, 因個乜, 為什乇, 做乜乇, 作乜, 胡為, 為麼, 做哪乇, 為嘛, 做事, 啥講究, 因何, 做啥, 做什麼, 因乜事幹, 幾何, 為乜, 為淡事幹, 做乜事幹, 為甚物, 妝乜, 介計, 為些哪樣, 為啥物, 因啥, 整乜嘢, 做麼, 為何呢, 何以, 為咋個, 做點高, 做什名, 奚, 做麼事, 仰解, 幹什麼, 怎作, 做乇, 因乜, 做乜, 緣何, 做咋哩, 為麼子, 為甚, 為什個, 為何, 做乜事, 為咩, 做呢, 為啥子, 為麼個, 敢咧, 幹乜勢, 為麼事, 做門, 為乜嘢, 為孰事, 是按怎, 幹嗎, 做物, 創甚物, 因乜嘢, 為甚們 formal, 咩, 乜頭路, 何故, 為物底, 為待西, 物代, 為乜事幹, 做咩, 做何, 為點高, 幹什, 何物事, 做乜計, 敢哪, 胡, 怎搞的, 怎搞, 為什哩, 乜, 做哪門, 做呢乇, 啥個講究, 傒勢, 點解, 啥體, 為乜事, 啥個路道, 啥個緣故, 蔣講, 甚們事, 𠰻們, 為什麼, 何為, 做什乇, 為麼兒, 做物事, 按怎, 為點啥, 為啥體, 因為甚, 因乜緣故, 做乜嘢, 做麼個, 敢哪誌

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Jyutping wai6 mat1
Pinyin wèi miē

Definitions (粵典–words.hk)
  1. 代詞
    因為​咩​原因
    why; for what reason
    • 為乜你要賭到破產?
      为乜你要赌到破产?
      wai6 mat1 nei5 jiu3 dou2 dou3 po3 caan2?
      Why did you have to gamble so much that you became bankrupt?
  2. 近義詞
    點解
Definitions (Kaifangcidian)
  1. 為什麼 – 为什么

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Jyutping wai4 me1
Pinyin wéi miē

Definitions (CC-CANTO)
  1. (interrogative adverb) what for; why
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    做嘢咁搏命为乜啊?
    做嘢咁搏命為乜啊?
    zou6 je5 gam3 bok3 meng6 wai4 mat1 aa1 ?
    • What's the sense of working so hard?
Examples (粵典–words.hk)
  1. Cantonese
    为乜
    為乜
    wai6 mat1
    • for what
  2. Cantonese
    畀人con足三日三夜疲劳轰炸,都唔知为乜。
    畀人con足三日三夜疲勞轟炸,都唔知為乜。
    bei2 jan4 kon1 zuk1 saam1 jat6 saam1 je6 pei4 lou4 gwang1 zaa3, dou1 m4 zi1 wai6 mat1.
    • (We've) been bombed by questions in the open forum for entirely three days and three nights. (We've) really got no idea what that's for.
  3. Cantonese
    为乜你要赌到破产?
    為乜你要賭到破產?
    wai6 mat1 nei5 jiu3 dou2 dou3 po3 caan2?
    • Why did you have to gamble so much that you became bankrupt?