'Stratagem' in the Bible

and plotted together to arrest Jesus by stealth and kill Him.

It was now two days before the Passover and the feast of Unleavened Bread, and the High Priests and Scribes were bent on finding how to seize Him by stratagem and put Him to death.

But continually encourage one another every day, as long as it is called “Today” [and there is an opportunity], so that none of you will be hardened [into settled rebellion] by the deceitfulness of sin [its cleverness, delusive glamour, and sophistication].