Necessary
Necessary adjective - Forcing one's compliance or participation by or as if by law.
Supplementary is an antonym for necessary.
Nearby Words: necessity, necessarily
Supplementary
Supplementary adjective - Available to supply something extra when needed.
Usage example: the teacher's edition of the textbook comes with a lot of supplementary material
Necessary is an antonym for supplementary.
Both words in one sentence
- While it isn't necessary to read all the supplementary material, it sure clears up many Call Backs in the novels that otherwise sound like Noodle Incidents.
Source: Archive Panic - Touhou fandom often postulate the idea (jokingly or not) that ZUN acquires all the necessary information to make the games and supplementary material from conversations with his drinking buddy, Yukari.
Source: Literary Agent Hypothesis -
Various supplementary material for the series explicitly states that, whilst the use of named spells is not necessary to practise magic (or swordsmanship, or exorcism, etc), it was codified as a form of ritualized magical combat in the distant past.
Source: Calling Your Attacks
Cite this Source
Supplementary and Necessary. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/necessary/supplementary
Necessary & Supplementary. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/necessary/supplementary>.
Supplementary or Necessary. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/necessary/supplementary.
Google Ngram Viewer shows how "necessary" and "supplementary" have occurred on timeline