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Jyutping mou4 si6
Pinyin wú shì

Definitions (Wiktionary)
  1. verb, Hainanese
    to not be
    (syn.) 否是, 無是, 不是, 伓是, 𱍤, 唔𱍤, 唔係, 勿是, 非, 毋係, 毋是, 唔是, 否, 無係
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他这个人一无是处。
    他這個人一無是處。
    tā zhè ge rén yī wú shì chù 。
    • He has nothing in him.
  2. Mandarin
    那些一无是处的废物被炒了。
    那些一無是處的廢物被炒了。
    nà xiē yī wú shì chù de fèi wù bèi chǎo le 。
    • Those good-for-nothing layabouts were sacked.
Examples (粵典–words.hk)
  1. Cantonese
    佢呢个人又懒又蠢,简直一无是处。
    佢呢個人又懶又蠢,簡直一無是處。
    • He is dumb, and he is lazy. There is nothing he is capable of.
  2. Cantonese
    呢部电脑又慢又旧,根本一无是处。
    呢部電腦又慢又舊,根本一無是處。
    • This laptop is slow and old. It is useless.
Examples (Wiktionary)
  1. Mandarin
    这辆车一无是处,纯粹是废品。
    這輛車一無是處,純粹是廢品。
    zhè liàng chē yī wú shì chù , chún cuì shì fèi pǐn .
    • This car is a no-good piece of junk, pure waste.