Giving or yielding no echo; calling forth no response.

adjective. Without echo or response.

adjective. Without echo.

adjective. having or producing no echo

"Instead of getting drunk every night or coming up with another act to fool doctors into prescribing them drugs, they funnel their money and creative energies into “vast, echoless complex [es]” whose “stalactites have been precision-cut by CNC-milling machines, the walls shaped by computer-programmable routers.”"

nonreflecting  nonreflective  

224-3041  arrow-like  cost-prohibitive  cube-shaped  dim-sighted