staying the same for a long time and not changing quickly or unexpectedly

a steadfast friend/ally 忠实的朋友／盟友

steadfast loyalty 毫不动摇的忠诚

The group remained steadfast in its support for the new system, even when it was criticized in the newspapers. 这个团体始终坚定不移地支持新体制，即使在它遭到报纸批评的时候也毫不动摇。

Synonyms: loyalstaunch unfaltering