unconstitutionality
Legal term referring to the quality or state of being unconstitutional. Used in discussions of laws, government actions, or policies.
The unconstitutionality of that law was contested in court.
The Supreme Court recognized the unconstitutionality of the ordinance.
Compound of 違憲 (iken, 'unconstitutional') + 性 (sei, '-ity; -ness'), forming an abstract noun meaning 'unconstitutionality'.