subpar
From Longman Business Dictionarysubparsub‧par /ˌsʌbˈpɑː-ˈpɑːr/ adjective1something that is subpar is below the level of quality, performance etc that you would usually expectThe banks had subpar earnings due to bad loans.2a subpar amount is below normal or averageInflation is subpar and still going down.3another word for BELOW PAR → see under par