noise·less \-zlə̇s\adjective Etymology:noise (I) + -less 1.: making or causing no noise or stir : free from noise : silent, quiet < kittens on noiseless feet > 2. a.: making less noise than is typical of its kind b.of a typewriter: having a type-bar action that is quieter than that of a standard typewriter • noise·less·lyadverb • noise·less·nessnoun-es