'Subtlety' in the Bible

Now therefore call unto me all the prophets of Baal, all his worshippers, and all his priests; let none be wanting: for I have a great sacrifice to do to Baal; whosoever shall be wanting, he shall not live. But Jehu did it in subtlety, to the intent that he might destroy the worshippers of Baal.

and they took counsel together that they might take Jesus by subtlety, and kill him.

Now after two days was the feast of the passover and the unleavened bread: and the chief priests and the scribes sought how they might take him with subtlety, and kill him: