'Murderous' in the Bible

The king told him, "Do as he said! Strike him down and bury him. Take away from me and from my father's family the guilt of Joab's murderous, bloody deeds.

The one who lives righteouslyand speaks rightly,who refuses gain from extortion,whose hand never takes a bribe,who stops his ears from listening to murderous plotsand shuts his eyes to avoid endorsing evil—

Their tongue is a murderous arrow; it speaketh deceit. A man speaketh peaceably to his neighbour with his mouth, but in his heart he layeth his ambush.