noiselessness|ˈnɔɪzlɪsnɪs| [f. as prec. + -ness.] The state or quality of being noiseless. 1847in Webster.1855J. R. Leifchild Cornwall 50 Let us listen in perfect noiselessness for a few moments.1893F. F. Moore Gray Eye or So II. 130 The butler..disappeared with the noiselessness of a shadow.