As the driver was inebriated he could not control the car.

inexperienced : having little knowledge or experience of a particular thing.
tired : in need of sleep or rest; weary.
befuddled : cause to become unable to think clearly.
intoxicated : (of alcoholic drink or a drug) cause (someone) to lose control of their faculties or behaviour.
inebriated : make (someone) drunk; intoxicate.


Synonym of inebriated is intoxicated