Lacking a constitution; not governed by or based on a constitution; without constitutional principles or structure.
From 'constitution' with the suffix '-less' (without or lacking). This is a rare term used to describe governments or systems that operate without written constitutional frameworks.
Some governments are 'constitutionless' in that they don't have a single written constitution—the UK is famously constitutional without one formal document, making this word pretty tricky to apply!
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