Related Clues:
- Not merely paying attention
- Criminal trial concern
- Engaged, in a way
- Absorbed in
- Strongly determined
- Not at all bored
- Undivided, as attention
- Lost in a good book, say
- It may be malicious
- Engaged, and then some
- Not at all distracted
- Hard thing to prove
- All eyes and ears
- Fully engrossed
- Riveted with attention