1. in a way that is not satisfactory or allowable

Examples

• The noise level in the library was unacceptably high.
• His behavior at the meeting was unacceptably rude.
• The product quality has declined unacceptably over the past year.
• She arrived unacceptably late for the important presentation.
• The restaurant’s service was unacceptably slow during dinner rush.
• The error rate in the report was unacceptably high for publication.