Understeer

Understeer is a term used to describe a condition when the car does not turn as well as it should. It should typically be avoided as the increased friction between the tire's tread and the road surface creates drag, which slows the car down.

Most likely causes
An error that amateur drivers tend to make is to increase the front camber, or tilt of the wheel, so much that the tire no longer has all its tread on the road surface. Because of this, the tire can not attain the minimum amount of friction requred to hold the vehicle to the road properly.