Abstract: A rotary blade for lawnmower and the like having a plurality of flexible blade members angularly spaced about a central hub portion. The blade is made of plastic, plastic composite, or composite material and is designed to cut grass and the like efficiently but to deflect around obstacles rather than cutting through them and possibly causing injury. Where impact with an obstacle is unavoidable by flexing, points of weakness are provided near the central hub portion of the blade to ensure that the blade members break off during use rather than cutting through an obstacle such as the operator's foot.