formal

Definitions

Done in accordance with rules of etiquette or conventional ceremony.

Following established forms, customs, or rules; official.

Designed for or suitable for serious or ceremonial occasions.

Examples

The company requires all employees to wear formal attire during client meetings.

He sent a formal letter of apology to the committee regarding his absence.

Synonyms

official ceremonial conventional stiff proper solemn structured

Antonyms

informal casual relaxed unofficial laid-back familiar unceremonious