Here are some ways to use "unacceptable" in a sentence:
Expressing Disapproval:
* "Your behavior at the party was unacceptable, and you will be grounded for a week."
* "The company's response to the complaints was unacceptable and showed a lack of respect for their customers."
* "It is unacceptable to discriminate against someone based on their race, religion, or gender."
Emphasizing Seriousness:
* "The level of violence in this city is unacceptable and requires immediate action."
* "The safety conditions in this factory are unacceptable and put workers at risk."
* "The delay in delivery is unacceptable and we demand a full refund."
Formal Settings:
* "The committee decided that the proposed budget was unacceptable due to its lack of detail."
* "The judge ruled that the evidence presented was unacceptable and could not be used in the trial."
Informal Settings:
* "I can't believe he said that! It was completely unacceptable."
* "This food is unacceptable! I'm sending it back to the kitchen."
Remember to use "unacceptable" judiciously, as it is a strong word that can convey a sense of anger or frustration. It's important to use it in a way that is appropriate for the situation.