WordWeb Online

1. Not active or activated
   "the quiescent level of centimetre wave-length solar radiation"
    
2. Marked by a state of tranquil repose
   "the quiescent melancholy of the town"
    
3. Being quiet or still or inactive
    
4. (pathology) causing no symptoms
   "a quiescent tumour"

See also: dormant, inactive, quiesce, quiescency, quiet

Encyclopedia: Quiescent