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Retardedness (noun)
The state or condition of being retarded.
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Retardation (noun)
The act of retarding or delaying; hindrance.
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Retardation (noun)
The extent to which anything is retarded; the result of any retarding or delay; mental, social, or physical slowness.
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Retardation (noun)
Extreme stupidity.
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Retardation (noun)
That which retards; an obstacle; an obstruction.
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Retardation (noun)
Deceleration; reduction in the magnitude of velocity.
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Retardation (noun)
A suspension which resolves upwards.
Wiktionary