Don't trust him my Lord! He is a filthy, treacherous rat!
Cantonese
佢份人好狡诈,有咩事唔好谂住靠佢。
佢份人好狡詐,有咩事唔好諗住靠佢。
He is a deceitful fella, don't count on him if anything happens.
Examples (Wiktionary)
Mandarin
狡兔三窟
狡兔三窟
jiǎo tù sān kū
a crafty person has more than one hideout (literally, “a crafty rabbit has three burrows”)
Mandarin
他为人狡猾,我看你还是不要去赴那鸿门宴吧!
他為人狡猾,我看你還是不要去赴那鴻門宴吧!
tā wéi rén jiǎo huá , wǒ kàn nǐ hái shì bù yào qù fù nà hóng mén yàn ba !
He is treacherous, so I think you had better not accept his invitation.
He is treacherous, so I think you had better not accept his invitation!
Mandarin
一切狡猾的人,不照科学态度办事的人,自以为得计,自以为很聪明,其实都是最蠢的,都是没有好结果的。
一切狡猾的人,不照科學態度辦事的人,自以為得計,自以為很聰明,其實都是最蠢的,都是沒有好結果的。
yī qiè jiǎo huá de rén , bù zhào kē xué tài dù bàn shì de rén , zì yǐ wéi dé jì , zì yǐ wéi hěn cōng míng , qí shí dōu shì zuì chǔn de , dōu shì méi yǒu hǎo jié guǒ de .
All sly people, all those who do not have a scientific attitude in their work, fancy themselves resourceful and clever, but in fact they are most stupid and will come to no good.