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Unconstitutional

/ˌʌˌnkɑnstəˈtuʃənəl/
B2
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(adj) Contrary to or violative of the constitution of a state or other sovereign institution.

He said it was unconstitutional.
The state court effected unconstitutional legislation without the federal government noticing.
CEFR Practice Quiz
The supreme court ruled that the new law was ____ and therefore it could not be enforced by the government today.

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