There may be lack of motivation or the ability to begin an activity; the person tires easily once the activity has begun; and. the person has mental fatigue or difficulty with concentration and memory to start or complete an activity.
plural ID's or IDs : a document (such as a card) bearing identifying information about and often a photograph of the individual whose name appears on it â called also ID card, identification card, identity card
ID. 1  a means of identification, as a card or bracelet containing official or approved identification information. 2  to identify. 3  to issue an ID to: Go to the admissions office if you haven't been ID'd yet.