The antonym for the word "specific" in the given sentence is "unclear."
Here's a breakdown to help you understand why:
1. The word "specific" means clearly defined, detailed, or explicit.
2. An antonym is a word that has the opposite meaning of another word.
3. In the sentence provided, it mentions that you need to be specific when placing an order to receive what you request. This implies that being clear and detailed is important in this context.
4. Among the options given, "unclear" stands out as the opposite of specific. If something is unclear, it lacks detail, precision, or explicitness, which is the opposite of being specific.
Therefore, in this case, "unclear" is the antonym for "specific" because being specific requires clarity and detail, while being unclear lacks those specific details.