The large tail looked like the formidable weapon it was.

The front legs of a 900-pound moose are formidable weapons.

The real answer would have been for it to limit its size and develop more formidable weapons.

Even the spear had not become a very formidable weapon in the native's hands.

I don't know much about guns myself, but those certainly sound like very formidable weapons.

Information would have been a formidable weapon to bring her down.

Indeed, with perhaps a couple of hundred billion dollars on hand, China already holds a formidable weapon.

And the staff can be a formidable weapon, even against the sword.

A sense of humor can be a formidable weapon against somebody who doesn't have one!