[adjective] not formal; "conservative people unaccustomed to informal dress"; "an informal free-and-easy manner"; "an informal gathering of friends"
[adjective] not officially recognized or controlled; "an informal agreement"; "a loose organization of the local farmers" Synonyms:loose
[adjective] used of spoken and written language
[adjective] having or fostering a warm or friendly atmosphere; especially through smallness and informality; "had a cozy chat"; "a relaxed informal manner"; "an intimate cocktail lounge"; "the small room was cozy and intimate" Synonyms:cozy, intimate
