A constitution that requires a complex procedure for the amendment of its provision is described as

A constitution that requires a complex procedure for the amendment of its provisions is described as "rigid". This means that the process of amending the constitution is difficult and requires a special and often lengthy process. The idea behind a rigid constitution is to ensure that the basic principles and values of the constitution are protected from hasty and frivolous changes by the government or any other entity. In general, a rigid constitution is more difficult to change than a flexible one, which can be amended more easily and frequently.