When it comes to describing someone who is stubborn or resistant to change, there are many different words you can use in place of "stiff-neck". For example, you could say that the person is "inflexible", "unbending", or "unwilling to compromise". Other synonyms for "stiff-neck" might include "stubborn", "bullheaded", or "obstinate". Ultimately, the word you choose to use will depend on the exact shade of meaning you want to convey, as well as the context in which you are speaking or writing. Whether you are describing someone's personality or behavior, there is sure to be a synonym for "stiff-neck" that fits the bill perfectly.