echo

This word evokes a sense of emptiness or vastness, as an echo requires a void or a hard boundary to exist. It carries a ghostly quality, suggesting a remnant of something that has already passed or a lingering memory of an original event. In social or intellectual contexts, it describes a lack of originality or a ripple effect. When a sentiment is echoed, it suggests a shared agreement or a mirroring effect where one person's opinion is reinforced by others, often creating a feedback loop.