The difference between Necessary and Unnecessary
When used as adjectives, necessary means required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty, whereas unnecessary means not needed or necessary.
Necessary is also noun with the meaning: a place to do the "necessary" business of urination and defecation: an outhouse or lavatory.
check bellow for the other definitions of Necessary and Unnecessary
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Necessary as an adjective:
Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
Examples:
"Although I wished to think that all was false, it was yet [[necessary]] that 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 as an adjective:
Unavoidable, inevitable.
Examples:
"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 as an adjective (obsolete):
Determined, involuntary: acting from compulsion rather than free will.
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Necessary as a noun (UK, archaic, _, euphemism, usually with the definite article):
A place to do the "necessary" business of urination and defecation: an outhouse or lavatory.
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Unnecessary as an adjective:
Not needed or necessary.
Examples:
"The automatic child-frightener made clowns unnecessary."
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Unnecessary as an adjective:
Done in addition to requirements; unrequired.