Select the most appropriate ANTONYM of the underlined word in the following sentence.

You have made only perfunctory attempts to understand me!

careful

The most appropriate antonym of the underlined word perfunctory in the following sentence is careful.

• Perfunctory means "done without care or attention to detail."
• Careful means "taking or showing care or caution."

The other words do not have the same meaning as perfunctory, so they are not its antonyms.

• Adamant means "firmly resolved or determined."
• Basic means "forming the foundation or basis of something."
• Casual means "done without much thought or attention."