Substandard (adjective)

Of a lower quality or standard than is considered normal or acceptable.

Origin:

The term 'substandard' is derived from the combination of the prefix 'sub-' meaning 'below' and the word 'standard', referring to something that is below a generally accepted level of quality or acceptability.

Examples:

1. The building was found to be substandard and had to be demolished.
2. The product was deemed substandard and was taken off the shelves.
3. The school was criticized for offering substandard education.
4. Many people live in substandard housing conditions.
5. The service provided by the company was substandard and customers were unhappy.