informal
1. [ adjective ] not formal
Examples:

"conservative people unaccustomed to informal dress" "an informal free-and-easy manner" "an informal gathering of friends"

Related terms: formal casual unceremonious casual folksy familiar formality
2. [ adjective ] not officially recognized or controlled
Synonyms: loose
Examples:

"an informal agreement" "a loose organization of the local farmers"

Related terms: unofficial
3. [ adjective ] having or fostering a warm or friendly atmosphere; especially through smallness and informality
Synonyms: intimate cozy
Examples:

"had a cozy chat" "a relaxed informal manner" "an intimate cocktail lounge" "the small room was cozy and intimate"

Related terms: friendly
4. [ adjective ] used of spoken and written language
Related terms: formal common colloquial subliterary unliterary epistolary slangy unrhetorical formality
Similar spelling:   informally
  inform
  informality
  in_for
  informant
  informatory
  informative
  information
  informatics
  informer
  informed
  informing
  inpour
  infirm
  inboard
  in_front
  in_force