Pronunciation: (sub-stan'durd),[key] —adj. 1. below standard or less than adequate: substandard housing conditions. 2. noting or pertaining to a dialect or variety of a language or a feature of usage that is often considered by others to mark its user as uneducated; nonstandard.
3. Insurance. a. not measuring up to an insurer's regular standards in undertaking risks: a substandard risk. b. pertaining to insurance written to cover substandard risks.