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psychology - n. the science or study of the mind and behavior
personality - n. the set of emotional qualities and ways of behaving that makes a person different from other people
enthusiastic - adj. feeling or showing strong excitement about something: filled with or marked by enthusiasm
depression - n. a serious medical condition in which a person feels very sad, hopeless, and unimportant and often is unable to live in a normal way
fatigue - n. the state of being very tired: extreme weariness
