Select the most appropriate ANTONYM of the given word.

Casual

Formal

The most appropriate antonym of the word casual is formal.

• Casual means "relaxed and unconcerned."
• Formal means "requiring or displaying strict adherence to convention or etiquette."

The other words do not have the same meaning as formal.

• Spiritual means "relating to or affecting the human spirit or soul."
• Personal means "belonging or relating to a particular person rather than to anyone else."
• Traditional means "relating to or preserving the traditional customs or beliefs of a particular group or people."