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Use "unsteadiness" in a sentence
"He suspected her unsteadiness was a reaction to their narrow escape from death."
"The artificiality of side-saddle riding extends even to the horse, which must be free from certain faults, such as unsteadiness in mounting, that would not render him unsuitable to carry a male rider."
"When in his unsteadiness a few had fallen to the floor, he had yelled, Hey!"