backwardness

from WordNet (r) 3.0 (2006)

backwardness
    n 1: lack of normal development of intellectual capacities [syn:
         {retardation}, {mental retardation}, {backwardness},
         {slowness}, {subnormality}]

from The Collaborative International Dictionary of English v.0.48

backwardness \back"ward*ness\, n.
   The state of being backward.
   [1913 Webster]

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