informal

(a) not formal
- conservative people unaccustomed to informal dress
- an informal free-and-easy manner
- an informal gathering of friends
(s) not officially recognized or controlled
- an informal agreement
- a loose organization of the local farmers
loose,
(a) used of spoken and written language
(s) 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
cozy, intimate,

loose cozy intimate

formal

informed informer

informality informally