General alternatives:
* Listen intently
* Pay close attention
* Listen carefully
* Listen deeply
* Be attentive
* Tune in
* Hear between the lines
* Pick up on subtle cues
* Listen with your whole being
More figurative alternatives:
* Listen with your heart
* Listen with your soul
* Listen with your intuition
* Read between the lines
* See beyond the surface
* Understand the unspoken
* Be perceptive
Alternatives emphasizing empathy:
* Empathize
* Connect emotionally
* Understand the other person's perspective
* Walk in their shoes
* Be sensitive to their feelings
The best alternative will depend on the specific situation and the message you want to convey.