Informal
Informal adjective - Not rigidly following established form, custom, or rules.
Usage example: an informal meeting allowed everyone to get acquainted
Proper
Proper adjective - Following the established traditions of refined society and good taste.
Usage example: the formal ball called for proper attire—tuxedos and full-length gowns only
Both words in one sentence
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Given the reluctance of Steven Spielberg and George Lucas to confirm a proper Indy sequel following The Last Crusade, many fans came to refer to this game by the informal title Indiana Jones 4.
- For those confused: Buffalo is a city (proper noun), an informal name for the American Bison (noun), and synonym for bully (verb).
- Main cast has much of informal moments, including the stretching of proper procedures regarding witness interrogation and dealing with minor criminals.
Source: Series / Nash Bridges
Cite this Source
Proper and Informal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/informal/proper
Informal & Proper. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/informal/proper>.
Proper or Informal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/informal/proper.
Google Ngram Viewer shows how "informal" and "proper" have occurred on timeline