substandard

listen to the pronunciation of substandard
Английский Язык - Турецкий язык
Английский Язык - Английский Язык
Of inferior quality; not meeting the minimum quality requirements

They built this with substandard parts. No wonder it collapsed.

used of merchandise
falling short of some prescribed norm; "substandard housing"
not as good as the average, and not acceptable non-standard, standard standard
{s} below standard, below the norm, of low quality
substandard
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