/ˌʌnkɒnstɪˈtjuːʃənəl/ – adjective
Definition: không hợp hiến.
A more thorough explanation: “Unconstitutional” refers to something that is not in accordance with or violates the provisions of a constitution, especially the constitution of a particular country or jurisdiction.
Example: The court ruled that the new law was unconstitutional because it violated the First Amendment rights of the citizens.