1. forbidden by law or authority; banned or prohibited
2. condemned or denounced as dangerous or undesirable

Examples

• The use of cell phones during the exam was strictly proscribed.
• Certain chemicals are proscribed in food production due to health risks.
• The organization was proscribed by the government for its illegal activities.
• Smoking is proscribed in all public buildings.
• The proscribed books were removed from the library shelves.
• Such behavior is proscribed by the school’s code of conduct.