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in a way that does not meet the required standard or level of approval
- The product's performance was unacceptably low, leading to numerous customer complaints.
- Her behavior at the meeting was unacceptably rude, causing discomfort among the attendees.
- The delays in project completion were deemed unacceptably long by the client.
- The quality of the customer service was rated unacceptably low in the recent survey.
- The employee's repeated errors were considered unacceptably detrimental to the team's success.
Antonyms: