informal
adj.
not formal
conservative people unaccustomed to informal dress|an informal free-and-easy manner|an informal gathering of friends
adj.
used of spoken and written language
adj.
not officially recognized or controlled
an informal agreement|a loose organization of the local farmers
Synonym: loose
adj.
having or fostering a warm or friendly and informal atmosphere
had a cozy chat|a relaxed informal manner|an intimate cocktail lounge|the small room was cozy and intimate
Synonym: cozy, intimate
Antonym: formal