Translation of "steadfast" into Japanese

Nevertheless, the girl remained steadfast, which led to opposition and her having to leave home.

それでも少女は堅く立ち,そのために反対が生じ,家を出なければなりませんでした。

My dedication and baptism helped me to remain steadfast in keeping my goals alive during the remaining years I spent attending school.

献身し,バプテスマを受けていたので,学業を終えるまでの数年間,目標を固く保つことができました。