setback (n.)

• arrest
• atavism
• backsliding
• bafflement
• balk
• blockage
• blocking
• blow
• buffet
• check
• checkmate
• closure
• comedown
• confusion
• constriction
• cramp
• dash
• deceleration
• defeat
• delay
• descent
• detainment
• detention
• disappointment
• discomfiture
• disillusionment
• dissatisfaction
• down
• drag
• failure
• fiasco
• fixation
• fizzle
• flagging
• foil
• foiling
• frustration
• hindrance
• holdup
• impediment
• inhibition
• interference
• interruption
• lag
• lapse
• let
• letdown
• letup
• mirage
• negativism
• obstacle
• obstruction
• obstructionism
• occlusion
• opposition
• reaction
• rebuff
• recession
• recidivism
• recrudescence
• recurrence
• reentry
• reflux
• regress
• regression
• relapse
• renewal
• repression
• repulse
• resistance
• restraint
• restriction
• retardation
• retroflexion
• retrogression
• return
• reversal
• reverse
• reversion
• rollback
• rout
• slackening
• slowdown
• slowing
• squeeze
• stranglehold
• stricture
• suppression
• tantalization
• tease
• throwback