Words to Describe impediments

How impediments often is described ("________ impediments")

• insuperable
• such
• principal
• regulatory
• bureaucratic
• biggest
• chief
• substantial
• loose
• obvious
• various
• many
• institutional
• organizational
• political
• legal
• temporary
• cultural
• potential
• lawful
• physical
• natural
• additional
• legislative
• fewer
• formidable
• main
• minor
• internal
• administrative
• serious
• ideological
• artificial
• mechanical
• usual
• matrimonial
• further
• practical
• outward
• unexpected
• key
• domestic
• dangerous
• slight
• psychological
• insurmountable
• greatest
• constitutional
• technological
• possible
• numerous
• structural
• powerful
• unnecessary
• procedural
• significant
• severe
• other
• major
• canonical
• technical
• external