We don't have synonyms for understeered yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are understeer and understeers.
(n) :
The condition in which the front wheels of a car fail to follow the desired curve while cornering, instead following more of a straight-line trajectory, losing a degree of traction, and so slipping off the required line.
(v) :
The action of a car when it does not follow the desired curve while cornering. Tyre slip of the front wheels.
(n) :
The condition in which the front wheels of a car fail to follow the desired curve while cornering, instead following more of a straight-line trajectory, losing a degree of traction, and so slipping off the required line.
(v) :
The action of a car when it does not follow the desired curve while cornering. Tyre slip of the front wheels.