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Jyutping mei6 zi1 sou3
Pinyin wèi zhī shù

Definitions (CC-CEDICT)
  1. unknown quantity
Definitions (CC-CANTO)
  1. (noun) Uncertainty
Definitions (粵典–words.hk)
  1. 名詞
    唔​知​或者​唔​肯定​嘅​事
    sth unknown or uncertain; literally: unknown number
    • 呢次活動搞唔搞得成係一個未知數。
      呢次活动搞唔搞得成系一个未知数。
      ni1 ci3 wut6 dung6 gaau2 m4 gaau2 dak1 seng4 hai6 jat1 go3 mei6 zi1 sou3.
      It is still uncertain whether this event can be held or not.
  2. 名詞
    (​數學​)​變量​;​方程式​入面​未知​嘅​數​,​要​經過​一輪​運算​先會​揾​到​嘅​數
    (maths) unknown number
  3. 近義詞
    未知之數
Definitions (Wiktionary)
  1. noun
    unknown quantity
  2. noun
    the unknown; something undetermined
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #4313
Examples (粵典–words.hk)
  1. Cantonese
    呢次活动搞唔搞得成系一个未知数。
    呢次活動搞唔搞得成係一個未知數。
    ni1 ci3 wut6 dung6 gaau2 m4 gaau2 dak1 seng4 hai6 jat1 go3 mei6 zi1 sou3.
    • It is still uncertain whether this event can be held or not.