Which of the following words is closest in meaning to “Vacuous”?

Vacuous means empty; lacking ideas.

• Correct answer - empty: it has the same meaning as Vacuous.
• intelligent: clever - wrong, it does not mean the same as Vacuous.
• spacious: having plenty of room - wrong, it does not mean the same as Vacuous.
• selfish: caring only for oneself - wrong, it does not mean the same as Vacuous.