'Mischievous' in the Bible

Is there injustice on my tongue? Cannot my taste discern mischievous things?

They also that seek after my life lay snares for me ; And they that seek my hurt speak mischievous things, And meditate deceits all the day long.

An evil-doer giveth heed to wicked lips; And a liar giveth ear to a mischievous tongue.

The beginning of the words of his mouth is foolishness; and the end of his talk is mischievous madness.