quiescent
1. [ adjective ] not active or activated
Examples:

"the quiescent level of centimeter wave-length solar radiation"

Related terms: inactive
2. [ adjective ] being quiet or still or inactive
Related terms: dormant
3. [ adjective ] marked by a state of tranquil repose
Examples:

"the quiescent melancholy of the town"

Related terms: quiet
4. [ adjective ] causing no symptoms
Examples:

"a quiescent tumor"

Related terms: inactive