To kill (a person or animal) immediately or instantly. A noun or pronoun can be used between "kill" and "outright." The trap is designed to kill outright so as to cause as little pain to the animal as possible. The poison doesn't kill you outright. Instead, it slowly works its way through your body, causing organs to shut down as it goes. He was killed outright by the force of the impact.
killed immediately. The driver was killed outright in the accident. Twenty people were killed outright in the explosion.