Cool; awesome; neat.
Intentionally causing or reveling in pain and suffering; merciless, heartless.
Harsh; severe.
To a great degree; terribly.
To violently provoke (a child) in the belief that this will make them more assertive.
To spoil or ruin (one's chance of success)
The natural inclination to do whatever is necessary to succeed (including extreme violence)
Used other than figuratively or idiomatically: see killer, instinct.