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Use "vainness" in a sentence
"O the vainness, and the frailties, and the foolishness of men!"
"“Oh dear!” exclaimed Ariadne, feeling the vainness of her wish to fly from the god."
"I have seen the strange madness of futility fall upon them when a little thing like a spinning dust-cloud, or the hollow crying of a bird, or the moan of the wind through bare branches brought to their gloomy minds the emptiness of life and the vainness of existence."