informal

Meanings

1. 1
   adj

   Relaxed and friendly, not following strict rules or ceremony.

   We had an informal dinner with a few close friends.

2. 2
   adj

   Used in everyday, casual speech or writing rather than in serious or official situations.

   "Kids" is an informal word for children.

3. 3
   adj

   Not official or not arranged in an official way.

   They reached an informal agreement over coffee.

From in- + formal.

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