Words to Describe challenges

How challenges often is described ("________ challenges")

• tremendous
• present
• daunting
• biggest
• greater
• substantial
• similar
• many
• organizational
• specific
• emotional
• legal
• ethical
• potential
• unprecedented
• environmental
• exciting
• physical
• additional
• contemporary
• peremptory
• theoretical
• formidable
• main
• internal
• serious
• particular
• difficult
• interesting
• ongoing
• competitive
• critical
• daily
• new
• key
• intellectual
• strategic
• methodological
• greatest
• constitutional
• technological
• economic
• global
• related
• current
• numerous
• fundamental
• future
• conceptual
• unique
• academic
• special
• significant
• severe
• major
• developmental
• complex
• enormous
• technical
• external
• multiple