Nonechoic is a word that describes something that does not have the ability to echo. Synonyms for this term include non-echoing, nonreverberant, and nonreflective. These terms can be used to describe a variety of different situations, such as an empty room with no sound bouncing off the walls, or a surface that absorbs sound instead of reflecting it. Other synonyms for nonechoic might include dull, muted, or hushed, depending on the context in which the term is being used. Regardless of the specific word chosen, synonyms for nonechoic all describe something that does not create or enhance echoes in any way.