noiseless

adj

1. Producing no noise; without noise.

   “The movements of the cat were noiseless as it approached the mousehole.”

   “For by the hearth the children sit ⁠Cold in that atmosphere of Death, ⁠And scarce endure to draw the breath, Or like to noiseless phantoms flit: But open converse is there none, […]”

2. Containing no noise.

   “The core idea of the Nostega paradign is basically camouflaging messages by embedding them in a form of noiseless data by employing either altered authenticated data or legitimate untraceable data, as shown in Section 1.3.”