Unconstitutional (adjective)

1. In violation of or not in accordance with the constitution of a country or state.
2. Not in keeping with the principles of a constitution.

Origin:

Late 18th century: from un- "not" + constitutional.

Examples:

1. The court ruled that the law was unconstitutional.
2. The government's actions were deemed unconstitutional.
3. The new policy was considered unconstitutional by some experts.
4. The proposed amendment to the constitution was seen as unconstitutional by many.
5. The restriction on freedom of speech was unconstitutional.