What's the adjective for constitutionalism? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs constitute, constitutionalize and constitutionalise which may be used as adjectives within certain contexts.
“At any age, errors in diet will be all the more likely to tell upon the liver if there be any constitutional weakness in the functional power of the organ.”
“Questioning the legitimacy or constitutional propriety of an action by the executive is a useful device for the opposition.”