Step 1: Understand the meaning of "meticulous".
"Meticulous" is used to describe a person who pays extreme attention to detail. Such a person is very precise, thorough, and careful in their work or behavior.
Step 2: Analyze the options.
FALSE: Means untrue or incorrect — not related to attention to detail.
CAREFUL: Someone who takes great care and is thorough — this matches "meticulous".
CASUAL: Relaxed or unconcerned — the opposite of meticulous.
CAREFREE: Without worry — also opposite in tone to meticulous.
Hence, the word that best expresses the meaning is CAREFUL.