Definition of informal in English:

informal

Line breaks: in|for¦mal
Pronunciation: /ɪnˈfɔːm(ə)l
 
/

adjective

1Having a relaxed, friendly, or unofficial style, manner, or nature: an informal atmosphere an informal agreement between the two companies
More example sentences
  • It is an army establishment and although run on military lines the atmosphere is easy, informal and friendly.
  • The atmosphere is relaxed, informal and friendly.
  • The service throughout was extremely friendly and the informal atmosphere was enhanced by the fact that we felt we could have sat there all afternoon if we had wanted to.
Synonyms
casual, relaxed, easy-going, natural, unceremonious, unofficial, non-formal, unstudied, unaffected; open, friendly, intimate; simple, unpretentious, easy
informal unstuffy, unbuttoned, chummy, pally, matey
1.1(Of dress) casual; suitable for everyday wear: the guys wore very informal clothes
More example sentences
  • Cate nodded and slipped out of her informal dress that she had worn all day.
  • He liked jazz, preferred informal dress, didn't much care for hunting and shooting, and was openly contemptuous of red carpets.
  • Dress is informal and music will be provided by the Brose Walsh Band.
Synonyms
casual, relaxed, comfortable, everyday, sloppy, leisure; Frenchsportif
informal comfy, laid-back, sporty
2Denoting the grammatical structures, vocabulary, and idiom suitable to everyday language and conversation rather than to official or formal contexts.
More example sentences
  • The content of websites can be written in formal as well as informal language.
  • The blend of formal and informal language suits the school's mission and vision perfectly.
  • And what about informal and formal names for living things?
Synonyms
colloquial, vernacular, idiomatic, demotic, non-standard, popular, dialectal, non-literary; simple, natural, familiar, everyday, unofficial, unpretentious
informal slangy, chatty, folksy
3(Of economic activity) carried on by self-employed or independent people on a small scale, especially unofficially or illegally: Peru’s huge and dense informal sector of street vendors and cottage industries
More example sentences
  • There is no longer any mystery as to why so much economic activity in developing countries is in the informal sector.
  • In Peru's informal economic sector, street vendors sell anything from food to flowers.
  • It is believed that these informal sector activities create significant employment opportunities.
Synonyms
unofficial, irregular, grey, black, back-door, illegal, illicit

Derivatives

informally

adverb
More example sentences
  • The works are simply framed and labels with the title and price are informally stuck on the wall with sticky tape.
  • Yet most donors tie the bulk of their aid, formally and informally.
  • For companies and executives, blogs provide a way to talk informally to customers, vendors and employees.

Definition of informal in:

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