Quiescent1. (a.) Being in a state of repose; at rest; still; not moving; as, a quiescent body or fluid.
2. (a.) Not ruffed with passion; unagitated; not in action; not excited; quiet; dormant; resting.
3. (a.) Not sounded; silent; as, y is quiescent in day and say.
4. (n.) A silent letter.
Thesaurus Entries
abeyant, abiding, at a standstill, at rest, calm, changeless, cloistered, constant, contemplative, continuing, cool, do-nothing, dormant, durable, dwindling, ebbing, echoless, enduring, even-tenored, firm, fixed, frozen, halcyon, hush as death, hushed, idle, immobile, immutable, impassive, inactive, inaudible, inert, intact, inviolate, isolated, laissez-aller, laissez-faire, lasting, lurking, meditative, moldering, motionless, mousy, neuter, neutral, noiseless, pacific, paralytic, paralyzed, passive, peaceable, peaceful, permanent, perpetual, persistent, placid, potential, procrastinating, quiet, quietist, quietistic, remaining, reposeful, reposing, restful, resting, rigid, secluded, sedentary, sequestered, sequestrated, sheltered, silent, smooth, solid, soundless, stable, stagnant, stagnating, standpat, static, stationary, staying, steadfast, still, still as death, stillish, stilly, stoic, stolid, subaudible, subsiding, sustained, torpid, tranquil, unactive, unagitated, unaltered, unarticulated, unchangeable, unchanged, unchanging, unchecked, undestroyed, undisturbed, unfading, unfailing, unhearable, unmoved, unperturbed, unpronounced, unruffled, unshifting, unsounded, unstirring, untroubled, unuttered, unvaried, unvarying, unvocalized, unvoiced, vegetable, vegetative, waning, whist