informal

From Wiktionary

[change] Adjective

Positive informal

Comparative more informal

Superlative most informal

1. If something is informal, it is friendly and casual; it is not official.

   Can we get together for some informal talks before the meeting?

   School is generally quite informal. Many students even call their teacher by their first name.

[change] Antonyms

• formal

[change] Synonyms

• casual