Words to Describe trials

How trials often is described ("________ trials")

• consecutive
• blind
• fiery
• terrible
• farm
• successful
• prospective
• fair
• therapeutic
• many
• sequential
• several
• experimental
• term
• famous
• fewer
• later
• preclinical
• peculiar
• initial
• further
• uncontrolled
• bitter
• designed
• randomized
• ongoing
• scale
• comparative
• sore
• criminal
• clinical
• controlled
• separate
• recent
• severest
• sensational
• numerous
• civil
• successive
• future
• independent
• secret
• olympic
• early
• severe
• subsequent
• extensive
• preliminary
• mock
• previous
• multiple