Rest and Rejuvenation:
* Restful: This implies a period of relaxation and recovery, which can be beneficial.
* Serene: This suggests a state of calmness and peacefulness.
* Tranquil: This implies a sense of quiet and stillness.
* Recharging: This emphasizes the idea of restoring energy and vitality.
Non-participation:
* Observant: This suggests someone is paying close attention to their surroundings, rather than actively participating.
* Reflective: This implies someone is thinking deeply and thoughtfully.
* Independent: This suggests someone is not reliant on others for activity or entertainment.
Alternatives:
* Inactive itself can sometimes be used positively, as in "an inactive volcano" (implying safety).
* Dormant: This suggests a potential for future activity, like a dormant seed waiting to sprout.
It's important to remember that the best way to find a positive connotation for "inactive" will depend on the specific situation and the message you want to convey.