Antonyms for the term "architectural accessibility" could include barriers, impediments, hindrances, obstacles, and disadvantages. These words represent the opposite of accessibility - they indicate difficulties or limitations that prevent individuals from accessing buildings or spaces. Without proper architectural accessibility, people with disabilities may face exclusion or unequal treatment, preventing them from fully participating in society. Additionally, poor accessibility can be a challenge for the elderly, parents with strollers, and anyone with temporary injuries. Thus, it is crucial for architects, builders, and designers to prioritize accessibility in their projects and ensure that everyone can enjoy equal access to public spaces.