9 Not a word from their mouth can be trusted; their heart is filled with malice. Their throat is an open grave; with their tongues they tell lies.

Read Psalm 5:9 Using Other Translations

For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulchre; they flatter with their tongue.
For there is no truth in their mouth; their inmost self is destruction; their throat is an open grave; they flatter with their tongue.
My enemies cannot speak a truthful word. Their deepest desire is to destroy others. Their talk is foul, like the stench from an open grave. Their tongues are filled with flattery.