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Jyutping mou5 lei5 jau4
Pinyin mǎo lǐ yóu

Definitions (CC-CANTO)
  1. "impossible"; "implausible"; "it cannot be"
Definitions (粵典–words.hk)
  1. 語句
    表示​對​一​啲​嘢​嘅​質​疑​、​不能​想象​,​認​為​嗰​樣​嘢​唔​合理​,​亦​都​可以​表達​唔​接受​現​實​嘅​情​緒
    used to describe something unexpected, unreasonable or illogical, or to express denial to the reality; "it can't be!", "surely not!"
    • 我冇理由會輸畀佢。
      我冇理由会输畀佢。
      ngo5 mou5 lei5 jau4 wui5 syu1 bei2 keoi5.
      It is impossible for me to be beaten by her.
    • 佢冧你?冇理由,佢招呼都冇同你打過,點會啊?
      佢冧你?冇理由,佢招呼都冇同你打过,点会啊?
      keoi5 lam1 nei5? mou5 lei5 jau4, keoi5 ziu1 fu1 dou1 mou5 tung4 nei5 daa2 gwo3, dim2 wui5 aa3?
      He has a crush on you? It can't be. He hasn't greeted you ever, how come so?
Definitions (Wiktionary)
  1. verb, Cantonese
    it is unreasonable; it is impossible; it cannot be
    (syn.) 冇奶油
    • 你自己闯祸,冇理由要人哋帮你执手尾。
      你自己闯祸,冇理由要人哋帮你执手尾。
      nei5 zi6 gei2 cong2 wo6, mou5 lei5 jau4 jiu3 jan4 dei6 bong1 nei5 zap1 sau2 mei5.
      You're the one who got into trouble. It's unreasonable for others to pick up after you.
    • 我琴日先至入油之嘛,冇理由咁快冇晒油㗎。
      我琴日先至入油之嘛,冇理由咁快冇晒油㗎。
      ngo5 kam4 jat6 sin1 zi3 jap6 jau2 zi1 maa3, mou5 lei5 jau4 gam3 faai3 mou5 saai3 jau2 gaa3.
      I just refueled my car yesterday. It is impossible that my tank is almost empty this quickly.
Examples (粵典–words.hk)
  1. Cantonese
    只游戏咁好玩,作为机迷冇理由唔跟机玩埋一份啩?
    隻遊戲咁好玩,作為機迷冇理由唔跟機玩埋一份啩?
    zek3 jau4 hei3 gam3 hou2 waan4, zok3 wai4 gei1 mai4 mou5 lei5 jau4 m4 gan1 gei1 waan2 maai4 jat1 fan6 gwaa3?
    • This game is so fun; as a gamer, there is no reason not to join this game, right?
  2. Cantonese
    买影音器材嘅时候要考虑实际需要,例如你个厅劲细,你冇理由买部大电视。
    買影音器材嘅時候要考慮實際需要,例如你個廳勁細,你冇理由買部大電視。
    • When you buy audio & visual gadgets, you should think about your needs. For example, if your sitting room is small, you should not buy a big TV.
  3. Cantonese
    佢每个月人工一万蚊,照计佢冇理由可以养架车架㖞。
    佢每個月人工一萬蚊,照計佢冇理由可以養架車架喎。
    • He has a monthly salary of $10000, normally he shouldn't be able to keep a car.
  4. Cantonese
    我冇理由会输畀佢。
    我冇理由會輸畀佢。
    ngo5 mou5 lei5 jau4 wui5 syu1 bei2 keoi5.
    • It is impossible for me to be beaten by her.
  5. Cantonese
    佢冧你?冇理由,佢招呼都冇同你打过,点会啊?
    佢冧你?冇理由,佢招呼都冇同你打過,點會啊?
    keoi5 lam1 nei5? mou5 lei5 jau4, keoi5 ziu1 fu1 dou1 mou5 tung4 nei5 daa2 gwo3, dim2 wui5 aa3?
    • He has a crush on you? It can't be. He hasn't greeted you ever, how come so?
Examples (Wiktionary)
  1. Cantonese
    你冇女朋友?梗系唔信啦!冇理由㗎。你…几好呀!
    你冇女朋友?梗系唔信啦!冇理由㗎。你…几好呀!
    nei5 mou5 neoi5 pang4 jau5? gang2 hai6 m4 seon3 laa1! mou5 lei5 jau4 gaa3. nei5... gei2 hou2 aa3!
    • You don't have a girlfriend? Of course I don't believe you! Impossible. You're… not bad!
  2. Cantonese
    你自己闯祸,冇理由要人哋帮你执手尾。
    你自己闯祸,冇理由要人哋帮你执手尾。
    nei5 zi6 gei2 cong2 wo6, mou5 lei5 jau4 jiu3 jan4 dei6 bong1 nei5 zap1 sau2 mei5.
    • You're the one who got into trouble. It's unreasonable for others to pick up after you.
  3. Cantonese
    我琴日先至入油之嘛,冇理由咁快冇晒油㗎。
    我琴日先至入油之嘛,冇理由咁快冇晒油㗎。
    ngo5 kam4 jat6 sin1 zi3 jap6 jau2 zi1 maa3, mou5 lei5 jau4 gam3 faai3 mou5 saai3 jau2 gaa3.
    • I just refueled my car yesterday. It is impossible that my tank is almost empty this quickly.