Words to Describe enquiries

How enquiries often is described ("________ enquiries")

• such
• polite
• directory
• scientific
• necessary
• discreet
• parliamentary
• similar
• informal
• eager
• reasonable
• official
• many
• empirical
• careful
• specific
• experimental
• ethical
• philosophical
• formal
• confidential
• systematic
• persistent
• theoretical
• few
• anxious
• departmental
• particular
• general
• public
• initial
• historical
• usual
• exhaustive
• due
• further
• direct
• postal
• personal
• judicial
• routine
• thorough
• frequent
• tentative
• detailed
• psychological
• recent
• statistical
• urgent
• solicitous
• numerous
• proper
• future
• curious
• independent
• secret
• metaphysical
• special
• subsequent
• diligent
• extensive
• elaborate
• local
• preliminary
• minute
• technical
• previous