soundless, unobtrusive, flameless, condenser microphone, rattly, piezo, corona discharge, unpowered, illuminant, sunblind, omnidirectional, tympanic, photoflash, frictionless, thermionic, nonreflective, hum, zoot, rechargeable, emitting, internal combustion, thermic, wankel engine, toroidal, nonconductive, variable resistor, tesla coil, vacuum tube, immersible, lucent, transmissive, subminiature, uncooled, unnoticeable, cassette deck, imperceptible, ductless, electroluminescent, stereophonic, infrasonic, underslung, monotonic, millivolt, effortless, tactile sensation, piezoelectric crystal, scritch, twistable, electrothermal, milliampere, ambient, electrokinetic, ultraviolet lamp, resonant cavity, luminous efficacy, ultra, metallic, compact, halogen, photoelectric, tronic, incandescent lamp, miniaturized, plink, tailstock, parabolic reflector, watt, microphonic, gatling gun, dot matrix, whooshing, electron optics, nicad, amp, bioelectric, reciprocating engine, pneumatic drill, lightless, electric, suppresser, synchronous motor, sound, muffled, photoconductive, adiabatic, mountable, crystal oscillator, photomultiplier, valveless, cleanable, magnetic dipole, knurled, electromotive force, shockproof, bypass capacitor, flutelike, whump, gateless, mouldable, fresnel lens, tacho, galvanic, stealthy, unhurried, slow, brisk, jerky, swift, stumbling, swifter, unimpeded, unresting, unsteady, brisker, choppy, circuitous, leisurely, noisy, onward, swiftest, unstoppable

quiet