Dictionary and Thesaurus

Definition of Informal

• (a.) Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writting, proceeding, or visit.
• (a.) Deranged in mind; out of one's senses.

Synonyms of Informal

• Loose
• Cozy
• Intimate

Antonyms of Informal

• Formal
• Formal

Homophones of Informal