IPA: //sʌbˈpɑːr//
KK: /sʌbˈpɑr/
Not meeting the expected standard or quality; below average.
The restaurant received poor reviews because the food was subpar.
Subpar → It is formed from "sub-" (meaning under or below) and "par" (from Old French *par*, meaning equal or standard). The word "subpar" means below the standard or not meeting expectations.
Think of being 'under' ('sub-') the 'standard' ('par') — that's why subpar means something that is below the expected level.