Similar words: uselessness, noiseless, noiselessly, selflessness, carelessness, hopelessness, homelessness, tastelessness. Meaning: ['nɔɪzlɪsnɪs] 
n. the property of making no noise.
n. the property of making no noise. 
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(1) The fanless design ensures complete noiselessness and maintenance-free operation.
(2) They moved with absolute noiselessness.
(3) This method is characterized by noiselessness, non vibration, not polluting surroundings during construction.
(4) With brand new design, noiselessness and excellent quality in the welding spot, the welder is able to precisely control the welding energy.
(5) Its characteristics include fast speed, noiselessness, convenient usage and display multiplicity, etc. its shortcomings are only to look, but not to print out.
(6) Jacked-in pipe pile is widely used in practical projects with the merits of vibrationlessness, noiselessness and low cost of supervising the entire process.
(7) Its characteristics also cover fine kerfs, small heat affected zone, good cutting surface quality, noiselessness in cutting, smooth kerf edge, accurate verticality of kerf edge, etc.
More similar words: uselessness, noiseless, noiselessly, selflessness, carelessness, hopelessness, homelessness, tastelessness, relentlessness, artlessness, lawlessness, ruthlessness, fearlessness, restlessness, fecklessness, helplessness, tactlessness, recklessness, listlessness, worthlessness, sleeplessness, limitlessness, faithlessness, effortlessness, powerlessness, weightlessness, motionlessness, thoughtlessness, useless, baseless.