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Inessential (adjective)
Not essential.
“Leave inessential items behind when there is a fire alarm.”
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Inessential (adjective)
Lacking essence or being.
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Inessential (noun)
Something that is not essential
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Unessential (adjective)
Not essential.
“inessential|unimportant”
“essential”
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Unessential (adjective)
Void of essence, or real being.
“unsubstantial”
Wiktionary