inaccessible

adjective
1
difficult or impossible to reach, get or use
دسترسی‌ناپذیر, صعب‌الوصول, غیرقابل‌دسترسی, غیرقابل‌دسترس
opposite accessible(1)
2
difficult to understand or appreciate
غیرقابل‌درک, غیرقابل‌فهم, دشوارفهم
The language of teenagers is often completely inaccessible to adults.
Opera and high art are often seen as inaccessible to ordinary people.
opposite accessible(3)