"nonessential" in the noun sense
1. inessential, nonessential
anything that is not essential
"they discarded all their inessentials"
"nonessential" in the adjective sense
1. incidental, nonessential, accidental
not of prime or central importance
"nonessential to the integral meanings of poetry"- Pubs.MLA
"the character's motives remain accidental to the plot"
Source: WordNet® (An amazing lexical database of English)
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