Formal and Unapt

Formal

Formal adjective - Following or agreeing with established form, custom, or rules.
Usage example: a formal contract that was legally binding

Unapt is an antonym for formal.

Unapt

Unapt adjective - Not appropriate for a particular occasion or situation.

Formal is an antonym for unapt.
Cite this Source
Unapt and Formal. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/formal/unapt
Formal & Unapt. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/formal/unapt>.
Unapt or Formal. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/formal/unapt.
Google Ngram Viewer shows how "formal" and "unapt" have occurred on timeline