She was 'fanatically' devoted to her job.
a religious 'fanatic' [='extremist']
He is 'fanatical about' boating.
(..) - Have you lost your mind? - And live his life as a penitent. He is the heir to Highgarden, the future of House Tyrell. He can begin again. As a mindless fanatic. As a free man. You will leave for Highgarden today. There is no law that says you must stay here. I am the queen. (..)2016 TvShow: Game of Thrones Title: The Broken Man Season: 6 Episode 7