"informal" in the adjective sense
1. informal
not formal
"conservative people unaccustomed to informal dress"
"an informal free-and-easy manner"
"an informal gathering of friends"
2. informal, loose
not officially recognized or controlled
"an informal agreement"
"a loose organization of the local farmers"
3. informal
used of spoken and written language
4. cozy, intimate, informal
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"
Source: WordNet® (An amazing lexical database of English)
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