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Necessary (adjective)
Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
“Thesaurus:requisite”
“unnecessary”
“Although I wished to think that all was false, it was yet necessary that I, who thus thought, must in some sense exist.”
“It is absolutely necessary that you call and confirm your appointment.”
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Necessary (adjective)
Unavoidable, inevitable.
“inevitable|natural”
“evitable|incidental|impossible”
“If it is absolutely necessary to use public computers, you should plan ahead and forward your e-mail to a temporary, disposable account.”
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Necessary (adjective)
Determined, involuntary: acting from compulsion rather than free will.
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Necessary (noun)
A necessary” business of urination and defecation: an outhouse or lavatory.
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Unnecessary (adjective)
Not needed or necessary.
“The automatic child-frightener made clowns unnecessary.”
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Unnecessary (adjective)
Done in addition to requirements; unrequired.
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Unnecessary (adjective)
not needed
“some people feel that holiday insurance is unnecessary”
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Unnecessary (adjective)
more than is needed; excessive
“good construction is essential to avoid unnecessary waste”
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Unnecessary (noun)
unnecessary things
“Flora never wasted cash on unnecessaries”