absorbed attention, absorption, application, complex, compulsion, concentration, contemplation, deep study, deep thought, engagement, engrossment, fascination, fixation, fixed idea, hang-up, hypercathexis, idee fixe, immersion, intentness, involvement, irresistible impulse, meditation, morbid drive, obsession, obsessive compulsion, possession, preoccupation, prepossession, profound thought, rapt attention, ruling passion, single-mindedness, studiousness, study, submersion, tic