Vanity; or, falsehood, which is a vain thing, and wants the solidity of truth. With a double heart; pretending one heart, and that they speak from a kind and upright heart, when they really have another, even a cruel and deceitful heart.
Related Commentaries of Psalms 12:2
Psalms 12:2
2 They speak vanity every one with his neighbour: with flattering lips and with a doublea heart do they speak.