
Unacceptable
Strong Disapproval
Indicates a firm disagreement or disapproval of something that's often unacceptable to a large group.

The manager found the team's performance unacceptable.
Not Tolerable
Used when something is so bad or inappropriate that it can't be tolerated or endured.

Cheating on the exam is unacceptable and will result in expulsion.
Expectation Mismatch
Highlights the gap between what is expected and what actually happens, used in these situations often.

Your lateness is unacceptable; we expect punctuality.
Compare with
ImpermissibleImproperInappropriateInsupportableIntolerableJustifiableReasonableSatisfactorySuitable
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