This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Without echo.

adj. Without echo or response.

Giving or yielding no echo; calling forth no response.

adj. 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    cost-prohibitive    many-fingered    inflectionless    edgeless