retardation (n.)

• afterthought
• amentia
• arrest
• backwardness
• bind
• block
• blockage
• blocking
• check
• closure
• constraint
• constriction
• control
• cooling
• cramp
• cretinism
• curb
• curtailment
• deceleration
• delay
• detainment
• drag
• fixation
• flagging
• halt
• hang-up
• hindrance
• holdup
• idiocy
• imbecility
• impediment
• infantilism
• inhibition
• injunction
• insanity
• interdict
• interference
• interim
• interruption
• jam
• lag
• lagging
• let
• letdown
• letup
• logjam
• mongolianism
• mongolism
• monopoly
• moratorium
• moronity
• negativism
• obstruction
• obstructionism
• occlusion
• opposition
• pause
• prohibition
• protection
• protectionism
• rationing
• rein
• repression
• reprieve
• resistance
• respite
• restraint
• restriction
• retrenchment
• self-control
• setback
• simpleness
• simplicity
• slackening
• slowdown
• slowing
• slowness
• squeeze
• stay
• stop
• stoppage
• stranglehold
• stricture
• subnormality
• suppression
• suspension
• tie-up
• wait