That's one word for it. But it doesn't even begin to describe the just pure, sadistic evil these people inflicted on anyone who they got their hands on.
The Nips used to have butchering contests where they would give a prize for the most "artistic" manner of killing a prisoner.
They would try to invent new ways to torture Americans to death -- the slower the better. One of their favorites was to stake POWs to the ground over a bamboo bed. The bamboo would then grow through a person's body. The sadistic scum could count on three to five days of "fun" as the victim died in agony.
And these barbarians are our friends?
It's just too damned bad we didn't have more than two A-bombs.