Synonyms of substandard

1 Syllable
poor, bad, cheap, base, junk
2 Syllables
shoddy, subpar, baddest, lousy, wanting, low-rent, cruddy, badder, lemon, punker
3 Syllables
uncostly, second-rate, low-grade, second-best, second-class, subnormal
4 Syllables
suboptimal, low-quality, unrewarding
5 Syllables
inadequate, unacceptable