The word "open-plan" typically refers to a spacious layout with few partitions and walls, allowing easy interaction and flow between different areas. Its antonyms, however, would describe more closed-off and segregated spaces. Some examples of antonyms for open-plan include "partitioned," "segregated," "compartmentalized," "closed-off," "separated," "divided," and "isolated." These terms refer to spaces that have more obstructions or barriers, such as walls, doors, and partitions, which can hinder movement and communication between different areas. While open-plan layouts are often favored for their versatility and collaborative potential, closed-off spaces may offer more privacy or separation for tasks that require focused concentration or confidentiality.