Bad
ambush - To suddenly attack someone after hiding and waiting for them:
The brigade walked quietly to the hidden spot on the hill, patiently until the enemy walked in the valley below, so that they could ambush the unsuspecting enemy, who were taken by surprise.
divisive - Causing disagreement or hostility between people, tending to disrupt unity or harmony.
The election was fought over the deeply divisive issue of immigration, and people on either side of the issue can't see things from the other point of view.