Synonyms and related words :
absorbed attention, absorption, abstraction, application, brown study, close study, concentration, contemplation, contemplativeness, deep study, engagement, engrossment, immersion, intentness, involvement, meditation, melancholy, monomania, musing, obsession, pensiveness, preoccupation, profound thought, rapt attention, reflectiveness, reverie, single-mindedness, speculativeness, studiousness, study, submersion, thoughtfulness, wistfulness,