Abstract: A safety blade for rotary grass trimmers for cutting grass and weeds while avoiding the hazards of blade thrusting and of any loose debris being thrown by the spinning blade. The blade has a plurality of cutting vanes each with a rounded outside radial edge of varying radius which serves as a bumper as the blade spins. Each vane has upwardly beveled cutting edges which along with the rounded outside radial edge serves to nudge away, rather than lift and throw, any loose debris encountered by the spinning blade.