The term 'completely absorbed' can be described by three crossword solutions: RAPT (4 letters), ENRAPT (6 letters), and FULLYENGAGED (12 letters). RAPT is an adjective meaning 'absorbed or engrossed to the exclusion of all else'. ENRAPT is a verb meaning 'to fill with delight or wonder; to charm or captivate'. FULLYENGAGED is an adjective meaning 'fully involved or committed'. All three words describe the state of being completely absorbed in something, whether it be an activity, emotion, or thought.