unconstitutional

From un- +‎ constitutional.

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unconstitutional (comparative more unconstitutional, superlative most unconstitutional)

1. Contrary to or violative of the constitution of a state or other sovereign institution. [18th C.]

   Synonym: anticonstitutional

   Antonym: constitutional

   That recently passed political bill has been declared unconstitutional.

• anticonstitutional

• James A. H. Murray [et al.], editors (1884–1928), “Unconstitutional”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), volumes X, Part 1 (Ti–U), London: Clarendon Press, →OCLC, page 101, column 1.