The difference between Needless and Unnecessary
When used as adjectives, needless means not needed, whereas unnecessary means not needed or necessary.
check bellow for the other definitions of Needless and Unnecessary
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Needless as an adjective:
Not needed; unnecessary.
Examples:
"This new project of yours will only be a needless expense."
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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.