For this question, choose the option opposite in meaning to the word or phrase in italics.  The scientist conducted a meticulous experiment.

Analyze the question: You are asked for the word that is opposite in meaning (antonym) to "meticulous."

Explain the concept: "Meticulous" means showing great attention to detail; very careful and precise. Its antonym will describe someone who pays little attention to detail or is not careful.

Solution:

• A. careless: not taking care; sloppy. This is the opposite of meticulous.
• B. detailed: full of details. This is similar in meaning, not opposite.
• C. thorough: complete and careful. This is a synonym.
• D. careful: paying attention to avoid mistakes. This is a synonym.

Options B, C and D all mean the same or nearly the same as "meticulous," so they cannot be the antonym. Only "careless" expresses the reverse idea.

Answer: A. careless

Tip: In antonym questions, first spot the options that are synonyms of the given word. If three options mean about the same thing, they are almost certainly wrong, and the odd one out is usually your answer. Also, "meticulous" is a great word to remember: link it with "meticulous = very careful" and "careless = the opposite."