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Jyutping bat1 hou2 jung6
Pinyin bù hǎo yòng

Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 日常用語:臺
    不好用
  2. 日常用語:陸
    不好使
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    这把剪刀不好用。
    這把剪刀不好用。
    zhè bǎ jiǎn dāo bù hǎo yòng 。
    • These scissors don't cut well.
  2. Mandarin
    这个脚踏不好用。
    這個腳踏不好用。
    zhè ge jiǎo tà bù hǎo yòng 。
    • This pedal is stiff.
Examples (Wiktionary)
  1. Mandarin
    他家的产品变得又贵又不好用,甚至成了智商税,我只好退坑。
    他家的產品變得又貴又不好用,甚至成了智商税,我只好退坑。
    tā jiā de chǎn pǐn biàn dé yòu guì yòu bù hǎo yòng , shèn zhì chéng le zhì shāng shuì , wǒ zhǐ hǎo tuì kēng .
    • Their product has became so expensive and trashy that it's hardly not a scam. I have no choice but to quit being a fanboy of their brand.