Setting Up a Café: Which Opposite Fits?
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An opposite reverses a specific quality along the same scale. The adjective light contrasts with heavy when the topic is weight, but it contrasts with dark when the topic is brightness. Words describing physical position, like open and closed, operate independently from words describing security, like locked and unlocked. Changing the wrong quality confuses the instruction.
The wooden chair is light, so one server can carry it outside easily.