informal

/ɪnfˈɔːmə‍l/

/ˌɪnˈfɔɹməɫ/

informal

suitable for friendly, relaxed, casual, or unofficial occasions and situations

antonyms : formal

not officially recognized or controlled

synonyms : loose

used of spoken and written language

antonyms : formal

having or fostering a warm or friendly and informal atmosphere

synonyms : cozy

Examples

1. The language in text messages is usually quite informal.

2. We are very informal around here.

3. The party was an informal gathering of friends.

4. The staff had an informal celebration to mark the end of the project.