psyche

1 an immaterial force within a human being thought to give the body life, energy, and power <disturbing, enigmatic paintings that seem to embody the psyche of this brilliant but troubled artist> Synonyms soul, spiritRelated Words life, vitality; being, essence, quintessenceNear Antonyms body, flesh

2 the part of a person that feels, thinks, perceives, wills, and especially reasons <a novel that explores the psyche of a depressed teen> Synonyms brain, cerebrum, head, mind, thinkerRelated Words belfry, gray matter, intellect, intelligence, loaf [British slang], noodle, reason, skull; acumen, alertness, astuteness, brilliance, insight, judgment (or judgement), mentality, perception, perspicacity, sagacity, sapience, wisdom, wit; awareness, cognizance, consciousness, self-awareness, self-consciousness