Making disbelievers' efforts fruitless.
Such have not believed. Therefore Allah maketh their deeds fruitless. And that is easy for Allah. 33:19
Leading disbelievers down the road to hell.
Lo! those who disbelieve and deal in wrong, Allah will never forgive them, neither will He guide them unto a road, Except the road of hell, wherein they will abide for ever. And that is ever easy for Allah. 4:168-9
Casting people into the Fire.
We shall cast him into Fire, and that is ever easy for Allah. 4:30
Doubly punishing Muhammad's wives for lewdness.
O ye wives of the Prophet! Whosoever of you committeth manifest lewdness, the punishment for her will be doubled, and that is easy for Allah. 33:30