suboptimum
adjective
sub·op·ti·mum 
ˌsəb-ˈäp-tə-məm
variants or sub-optimum
: less than optimal : suboptimal
suboptimum sales/conditions
Just this year the mathematicians finally proved that any product designed by geniuses to be used by idiots is suboptimum.
John Gantz
John Gantz
Word History
First Known Use
1907, in the meaning defined above
Medical Definition
suboptimum
adjective
sub·op·ti·mum -məm
: suboptimal
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- constitutional water