You searched for: “more claustral
claustral (adjective), more claustral, most claustral
1. Of or related to a cloister or to a seclusion from the world: "The elderly couple lived a claustral life in which they separated from a normal existence in the world."
2. Etymology: from Latin claustrum, "bolt, bar". The Latin claustrum stands for claudtrom and literally means "that by which anything is shut up", and is formed from claudere, "to shut".