Without an echo; having no reflected sound or reverberating quality; silent or muted in a way that prevents echoes.
From 'echo' + '-less' (suffix meaning 'without'). This descriptive term developed to characterize spaces or conditions where sound absorption prevents typical echo effects.
Recording studios use echoless chambers called anechoic rooms, where every sound is swallowed instantly by special foam—it's so quiet that people often feel disoriented because our brains expect at least some sonic feedback.
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