Thy tongue deviseth mischief That is, expresses what thy wicked mind had devised. Thus skilfulness is ascribed to those hands which are governed by a skilful man, Psalms 78:72. Like a sharp razor, working deceitfully Wherewith a person, pretending only to shave off the hair, doth suddenly and unexpectedly cut a man's throat. So Doeg, pretending only to vindicate himself from the imputation of disloyalty, 1 Samuel 22:8, really intended to expose the priests, who were friends to David, to the king's fury and cruelty.
Related Commentaries of Psalms 52:2
Psalms 52:2
2 Thy tongue deviseth mischiefs; like a sharp razor, working deceitfully.