Choose the option opposite in meaning to the underlined word(s).My father's presentation was rather casual
Answer Details
The option opposite in meaning to "casual" in the sentence "My father's presentation was rather casual" is "formal."
When something is described as "casual," it means that it is relaxed, informal, or done without much preparation or attention to detail. On the other hand, when something is "formal," it is done with seriousness and in accordance with established rules or customs.
Therefore, if the father's presentation was described as "rather casual," the opposite of that would be "rather formal," indicating that the presentation was serious, prepared with attention to detail, and followed established rules or customs.