The state or characteristic of being needless.(noun)
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Use "needlessness" in a sentence
"While the wining goal should have been avoided, the needlessness of the defeat felt characteristic."
"Not undermining the merit of virtual references, everything should be in measure; it is such a pity and shame such leading massive projects should stop enjoying popularity with readership and such profound efforts devoted to their creation sink to needlessness."
"When I was reading Portfolios of the Poor, I kept thinking about the needlessness of all the characters' suffering."