1. below the usual or required standard; of poor quality

Examples

• The company recalled the substandard products after customer complaints.
• Students living in substandard housing conditions struggled to focus on their studies.
• The restaurant was closed due to substandard hygiene practices.
• Many workers were forced to accept substandard wages during the economic downturn.
• The building inspector found several substandard electrical installations.
• Parents complained about the substandard education their children were receiving.