Quiescent
QUIES'CENT, adjective [Latin quiescens.]
1. Resting being in a state of repose; still: not moving; as a quiescent body or fluid.
2. Not ruffled with passion; unagitated; as the mind.
3. Silent; not sounded; having no sound; as a quiescent letter. Sow mow, with w quiescent; say, day, with y quiescent
QUIES'CENT, noun A silent letter.