informal (EN)

adjective

adjective “informal”

1. not formal or official; casual; relaxed
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   We had an informal discussion over coffee about our future plans.
2. (of clothes) suitable for everyday use; not appropriate for formal occasions
   You can wear informal clothes like jeans and a T-shirt to the barbecue.
3. (of language) using everyday words and phrases; not formal
   In informal speech, people often use slang and contractions.
4. (of business) not following strict rules or illegal
   The sellers are part of the informal economy.