The term 'deeply absorbed' can be described by three words: ENRAPT (6 letters), RAPT (4 letters), and IMMERSED (8 letters). ENRAPT is an adjective meaning to be filled with delight or wonder, while RAPT is a verb meaning to be filled with intense admiration or enthusiasm. IMMERSED is an adjective meaning to be deeply involved in something. Together, these words describe the state of being deeply absorbed in something, such as a book or a conversation.