Quiescent

1. adjective

   marked by a state of tranquil repose

   “the quiescent melancholy of the town”

2. adjective

   being quiet or still or inactive

3. adjective

   (pathology) causing no symptoms

   “a quiescent tumor”

4. adjective

   not active or activated

   “the quiescent level of centimeter wave-length solar radiation”