What is the definition or description of: lack of motivation?

Amotivation: Amotivation, is a term for lack of motivation or drive to accomplish work, interpersonl, or recreational tasks. It commonly associated with a number of disorders and conditions, such as depression, marijuana (cannabis abuse) or other drug abuse, and neurological conditions often involving the frontal lobes.

Lack of Motivation: Is absence or deficiency in interest, desire & driving force. Some reasons for lack of motivation are lack of faith in one's abilities, low self-esteem, fear of failure, laziness, procrastination, nervous, lack of time, lack of incentives.