Which of the following words is the best antonym for the word "fastidious"?
Correct: B
The correct answer is B) careless. The word "fastidious" means meticulous or demanding in one's standards, and the word "careless" is an antonym because it implies a lack of attention to detail or a lack of concern for standards. Choice A is incorrect because "meticulous" is actually a synonym for "fastidious," as it also implies a high level of attention to detail. Choice C is incorrect because "thorough" implies a comprehensive or complete approach, which is not necessarily the opposite of being fastidious. Choice D is incorrect because "diligent" implies a high level of effort or persistence, which is not necessarily the opposite of being fastidious.