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Jyutping mung2 sing6 sing6
Pinyin měng shèng shèng

Definitions (CC-CANTO)
  1. (adj.) clueless, muddleheaded.
Definitions (粵典–words.hk)
  1. 形容詞
    懵​閉閉​、​懵懵​閉​;​思考​唔​清晰​;​唔​知道​周圍​發生​緊​咩​事
    stupid; muddle-headed; unable to think clearly
  2. 近義詞
    傻更更、烏啄啄
Definitions (Wiktionary)
  1. adj, Cantonese, ideophonic
    foolish; muddleheaded
    (syn.) 懵懵懂懂, 乌啄啄, 烏啄啄
Definitions (Kaifangcidian)
  1. 懵然不知
  2. 混然無知 – 混然无知
  3. 懵懵懂懂
  4. 糊裡糊塗 – 糊里糊涂
  5. 太過糊塗 – 太过糊涂
  6. 渾渾噩噩 – 浑浑噩噩
  7. 混混沌沌
Examples (粵典–words.hk)
  1. Cantonese
    前线警察成班傻仔仲 懵盛盛 唔知自己准备做condom。
    前線警察成班傻仔仲 懵盛盛 唔知自己準備做condom。
    cin4 sin3 seng4 baan1 so4 zai2 zung6 mung2 sing6 sing6 m4 zi1 zi6 gei2 zeon2 bei6 zou6 kon1 dam4.
    • Those stupid frontline police officers still don't realise that they are about to become "condoms".
  2. Cantonese
    一嚿饭噉,懵盛盛!
    一嚿飯噉,懵盛盛!
    jat1 gau6 faan6 gam2, mung2 sing6 sing6!
    • Such a lump of rice (=such an idiot)! You have no idea of what's going on.
  3. Cantonese
    懵盛盛
    懵盛盛
    mung2 sing6 sing6
    • dull-witted or bewildered
  4. Cantonese
    唉,今次搭沉船喇,原来间公司欠落一大笔债,我仲懵盛盛入左股添。
    唉,今次搭沉船喇,原來間公司欠落一大筆債,我仲懵盛盛入左股添。
    • Damn, I've taken a sinking ship this time, I didn't recognize the company has a lot of debts, and I still stupidly invested in it.