1. not active or activated

- the quiescent level of centimeter wave-length solar radiation

Similar word(s): inactive

2. marked by a state of tranquil repose

- the quiescent melancholy of the town

Similar word(s): quiet

3. being quiet or still or inactive

Similar word(s): dormant, inactive

4. (pathology) causing no symptoms

- a quiescent tumor

Similar word(s): inactive

Sentences with quiescent as an adjective:

- The bats were quiescent at that time of day, so we slowly entered the cave.

- The k is quiescent in "knight" and "know".