1. not satisfactory or allowable; not able to be accepted

Examples

• The quality of work was unacceptable and had to be redone.
• His behavior at the meeting was completely unacceptable.
• The restaurant found the health inspector’s conditions unacceptable.
• It’s unacceptable to arrive two hours late without calling.
• The noise level in the library became unacceptable.
• She considered the salary offer unacceptable for her experience level.