obsession (n.)

• absorption
• abstraction
• abulia
• alienation
• anxiety
• apathy
• application
• bedevilment
• bewitchery
• bewitchment
• captivation
• complex
• compulsion
• concentration
• contemplation
• conviction
• dejection
• depression
• detachment
• elation
• emotionalism
• enchantment
• engagement
• engrossment
• entrancement
• euphoria
• fascination
• fixation
• hang-up
• hypochondria
• hysteria
• hysterics
• illusion
• immersion
• indifference
• insensibility
• intentness
• involvement
• lethargy
• mania
• maya
• meditation
• melancholia
• monomania
• passion
• phobia
• possession
• preoccupation
• prepossession
• single-mindedness
• studiousness
• study
• stupor
• submersion
• thing
• tic
• twitching
• unresponsiveness
• witchery
• withdrawal