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Use "unsustained" in a sentence
""Opinions are worthless if unsustained by expertise and verifiable facts," she wrote."
"But what military surges teach us is that repeated but unsustained efforts can make things worse."
"There her manner of singing is described as "infantine and unsustained," characterized by a continual "effort to do that which, in fact, from natural qualifications, she could do without any effort at all.""