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
Webster's English Dictionary