Step 1: Understanding the question.
The question asks for an antonym of "METICULOUS," which means showing great attention to detail. Step 2: Analyzing the options. (A) Careful: Incorrect — Similar meaning. (B) Precise: Incorrect — Similar meaning. (C) Sloppy: Correct — Means careless or lacking attention to detail. (D) Thorough: Incorrect — Similar meaning. Step 3: Conclusion.
The correct answer is (C) Sloppy, as it is the opposite of meticulous.