水火 seoi² fo² {shuǐ huǒ}

(noun) water and fire

水火不容 seoi² fo² bat¹ jung⁴ {shuǐ huǒ bù róng}

1. completely incompatible
2. lit. incompatible as fire and water

水火無情〔--无-〕 seoi² fo² mou⁴ cing⁴ {shuǐ huǒ wú qíng}

1. Fire and water have no mercy (idiom). forces of nature beyond human control
2. implacable fate

水火不相容 seoi² fo² bat¹ soeng¹ jung⁴ {shuǐ huǒ bù xiāng róng}

incompatible; mutually exclusive; can never mix / get on with each other