nonessential
[adjective]
Synonyms: unnecessary, dispensable, expendable, extraneous, inessential, peripheral, superfluous, unimportant

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Antonyms: essential

[TahlilGaran] English Synonym Dictionary ▲

non·es·sen·tial (nŏnĭ-sěnshəl)
adj.
► Having little or no importance; not essential.
► Biochemistry. Being a substance that is required for normal functioning but does not need to be included in the diet because of the body's ability to synthesize it from other nutrients.

[TahlilGaran] American Dictionary ▲