Usage Note
Inconstitucional is a transparent compound of the prefix in- (not) + constitucional, directly mirroring the English 'unconstitutional'. It is a formal legal and political adjective applied to laws, decrees, or acts that violate a country's constitution. The related noun is inconstitucionalidad and the verb phrase is declarar inconstitucional. There is no false-friend risk for English speakers, but the word is long enough that learners often misstress it.
Examples
"La ley fue declarada inconstitucional."
Natural Translation
The law was declared unconstitutional.
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