retrogressive (adj.)

• ascending
• atavistic
• axial
• back
• backward
• cracking
• decadent
• degenerate
• descending
• downward
• draining
• drifting
• drooping
• dwindling
• effete
• fading
• failing
• falling
• flagging
• flowing
• fluent
• flying
• going
• passing
• progressive
• reactionary
• recessive
• regressive
• retroactive
• retrograde
• retrorse
• returnable
• reversible
• reversionary
• revertible
• rising
• rotary
• rotational
• rotatory
• running
• rushing
• sliding
• slipping
• soaring
• streaming
• upward
• waning
• withering
• worsening