formal
for-mal
adjective
Following strict rules of etiquette, ceremony, or dress; serious and proper.
"A formal dinner party requires smart clothing."
adjective
Done or made according to official rules or requirements; authorised.
"The company issued a formal statement."
adjective
Concerned with the shape, structure, or arrangement rather than content.
"We studied the formal elements of the painting."
Thesaurus
Synonyms: titular, black-tie, buckram, starchy, ceremonial, white-tie, form-only, prescribed, semi-formal, dress, stiff, ceremonious
Antonyms: informal