Webster's English Dictionary

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substandard

Cross references:
  1. nonstandard           
 
sub.stan.dard \.s*b-'stan-d*rd, 's*b-\ aj : deviating from or falling short 
   of a standard or norm : as  : of a quality lower than that prescribed by 
   law {~ canned goods } : conforming to a pattern of linguistic usage 
   existing within a speech c ommunity but not that of the prestige group in 
   that community : constituting a greater than normal risk to an insurer