steadfast

/ˈstɛdˌfæst/

marked by firm determination or resolution; not shakable

Chinese meaning: 坚定的；忠诚的

She remained steadfast in her commitment to environmental protection.

她始终坚定地致力于环境保护。

The steadfast support of his family helped him overcome difficulties.

家人坚定的支持帮助他克服了困难。