NET
5 One friend deceives another and no one tells the truth. These people have trained themselves to tell lies. They do wrong and are unable to repent.
Darby
5 And they act deceitfully every one with his neighbour, and speak not the truth: they teach their tongue to speak falsehood, they weary themselves with perverse dealing.
KJV
5 And they will deceive every one his neighbour, and will not speak the truth: they have taught their tongue to speak lies, [and] weary themselves to commit iniquity.