Essential
Essential adjective - Impossible to do without.
Usage example: a well-stocked public library is essential for the well-being of a community
Nonessential
Nonessential adjective - Not needed by the circumstances or to accomplish an end.
Usage example: money's tight, so we'll have to skip nonessential purchases
Essential is an antonym for nonessential in not needed or important topic.
Both words in one sentence
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He tells Harry that while essential plans should be simple and perfect (eg; apparate in front of your target and hit them with the Killing Curse), nonessential plans can be as complicated as you want, since by definition they're not important.
Source: Complexity Addiction
Cite this Source
Nonessential and Essential. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/essential/nonessential
Essential & Nonessential. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/essential/nonessential>.
Nonessential or Essential. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/essential/nonessential.
Google Ngram Viewer shows how "essential" and "nonessential" have occurred on timeline