Acceptable
Acceptable adjective - Of a level of quality that meets one's needs or standards.
Usage example: told the bike rental man that a ten-speed with four broken gears was not acceptable
Improper is an antonym for acceptable.
Improper
Improper adjective - Not appropriate for a particular occasion or situation.
Usage example: an improper use of slang in a formal piece of writing
Nearby Word: improperly
Both words in one sentence
- Though it is not required, it is considered highly improper if the daughters do not marry in order of their birth - the only time it's acceptable is if the older sister slips into the category of "Old Maid" around age twenty-three.
Source: Wedlock Block
Cite this Source
Improper and Acceptable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/acceptable/improper
Acceptable & Improper. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/acceptable/improper>.
Improper or Acceptable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/acceptable/improper.
Google Ngram Viewer shows how "acceptable" and "improper" have occurred on timeline