What are the opposite words for informal?

Antonyms for the word "informal" include formal, official, rigid, ceremonious, conventional, proper, decorous, and stiff. Formal implies adherence to established rules and customs, while official connotes a sense of authority and regulation. Rigid suggests strict and inflexible adherence to rules and protocol, whereas ceremonious implies an emphasis on tradition and ceremony. Conventional emphasizes adherence to established norms and traditions, while proper suggests adherence to etiquette and social norms. Decorous implies a sense of propriety and respectability, while stiff suggests a lack of warmth and flexibility. Overall, these antonyms highlight the importance of adhering to specific rules, customs or traditions instead of deviating from the norm.

Antonym of the day

doth to a turn
abstain, avoid, bear.