Related Clues:

• Thoroughly involved
• Fully engaged
• Deeply focused
• Kind of attention
• Really paying attention
• Extremely attentive
• Immersed
• Anything but bored
• Totally attentive
• Not merely paying attention
• Engaged, in a way
• Absorbed in
• Not at all bored
• Undivided, as attention
• Lost in a good book, say