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Jyutping bat1 ho2 jat1 sai3
Pinyin bù kě yī shì

Definitions (CC-CEDICT)
  1. to consider oneself unexcelled in the world
  2. to be insufferably arrogant
Definitions (粵典–words.hk)
  1. 形容詞
    狂妄​自滿​,​以為​一整​個​世界​嘅​其他人​都​比​自己​差​。
    extremely arrogant
    • 佢嗰副不可一世嘅嘴臉,真係好乞人憎!
      佢𠮶副不可一世嘅嘴脸,真系好乞人憎!
      keoi5 go2 fu3 bat1 ho2 jat1 sai3 ge3 zeoi2 lim5, zan1 hai6 hou2 hat1 jan4 zang1!
      His arrogant attitude is so annoying!
Definitions (Wiktionary)
  1. phrase, idiomatic
    to consider oneself the best in the world; to have an overweening or insufferable arrogance
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    啲叻嘅人通常都好不可一世。
    啲叻嘅人通常都好不可一世。
    di1 lik1 ge3 jan4 tung1 soeng4 dou1 hou3 bat1 ho2 jat1 sai3 。
    • Intelligent people are often arrogant.
Examples (粵典–words.hk)
  1. Cantonese
    佢𠮶副不可一世嘅嘴脸,真系好乞人憎!
    佢嗰副不可一世嘅嘴臉,真係好乞人憎!
    keoi5 go2 fu3 bat1 ho2 jat1 sai3 ge3 zeoi2 lim5, zan1 hai6 hou2 hat1 jan4 zang1!
    • His arrogant attitude is so annoying!