# unconstitutional

/ˌənˌkɑnstəˈtuʃənəɫ/ (US) · /ʌnkˌɒnstɪtjˈuːʃənəl/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/unconstitutional
Updated: 2026-05-03

## Definition

not allowed by the set of rules that a country or organization follows. If a law or action is unconstitutional, it is illegal because it goes against the constitution.

For teachers: not in accordance with the political constitution of a state or the governing principles of an organization. Often follows a linking verb or precedes a noun referring to legislation or executive actions.

## Examples

- The court ruled that the new law was unconstitutional.
- Civil rights lawyers argued that the police search was unconstitutional because it violated the right to privacy.
- The supreme court has the power to strike down any executive order it deems unconstitutional, ensuring that the government remains within its legal boundaries.

## Usage notes

- Typically used as a predicative adjective after 'be' or 'deem', or as an attributive adjective before nouns like 'law', 'act', or 'measure'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.