noun
Refers to a person who strictly adheres to the fundamental doctrines of a religion, ideology, or movement. Often used in religious contexts but can be extended to other fields.
彼はキリスト教のファンダメンタリストだ。
He is a Christian fundamentalist.
ファンダメンタリストたちは聖書の言葉を文字通りに解
Fundamentalists interpret the words of the Bible literally.