variants:
or sub-optimum
Definition of suboptimum
: 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
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Merriam-Webster unabridged
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Time Traveler for suboptimum
The first known use of suboptimum was in 1907
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