● Retardations
● Mental retardation
● Backwardness
● Deceleration
● Slowness
● Lag
● Slowing
● Slowdown
● Subnormality
● Aberrations
● Abnormality
● Absorptions
● Acceleration
● Activations
● Amentia
● Amplifications
● Attenuations
● Back
● Bak
● Branched chain ketoaciduria
● Cretin
● Cretinism
● Curvatures
● Deflections
● Deformations
● Degrees
● Deviations
● Down syndrome
● Drag
● Durations
● Dysostosis multiplex
● Elevations
● Equate
● Fluctuations
● Flywheel
● Galactosemia
● Gargoylism
● Hysteresis
● Idiocy
● Idiot
● Imbecile
● Imbecility
● Incidences
● Ineducable
● Insanity
● Klinefelter syndrome
● Kwashiorkor
● Lags
● Lah
● Lipochondrodystrophy
● Loadings
● Lysinemia
● Maple syrup urine disease
● Maxima
● Mental
● Mental defectiveness
● Mental deficiency
● Mongolianism
● Mongolism
● Moron
● Moronity
● Myelomeningocele
● Nack
● Overloads
● Phenylketonuria
● Pku
● Reductions
● Retard
● Retarder
● Retardment
● Scaphocephaly
● Suspension
● Tardation
● Trisomy 21
● Tyrosinemia
● Xxy-syndrome