Malcolm was un efficient killer, he liked to do it quick and then get away before the fuss started.

I come to find out after several years that they were using these same skills to be more efficient killers.

And he said Moscow was trying to modify smallpox into an even more efficient killer.

Clearly, the military wants to take young, single men and make efficient killers out of them.

He had shown no compassion; rather, the opposite, becoming an efficient killer.

Weaver is at once a loving father and a coolly efficient killer.

She was a calculating hunter and an efficient killer who lived by her own code.

They were here to take down a team of highly efficient killers.

Which was at least partly why they made such efficient killers.

You were either an efficient killer or you weren't.