unacceptable
adj.adj. so bad or wrong that you cannot allow it to continue. You use this when someone's behavior or a situation is not good enough to be allowed.
adj. not satisfactory or allowable; failing to meet the minimum standards of a particular group or situation. Often used in formal or professional contexts to express strong disapproval.
The manager told him that his rude behavior was unacceptable.
The airline offered a small voucher as compensation, but the passengers found the offer completely unacceptable given the long delay.
While minor errors are expected in a first draft, the sheer volume of factual inaccuracies in the final report was deemed unacceptable by the board of directors.
From Middle English unacceptabylle, equivalent to un- + acceptable.
Often modified by adverbs of degree like 'completely', 'totally', or 'wholly'.