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Use "incautiousness" in a sentence
"With characteristic Anglo-Saxon incautiousness he had brought on board with the rest of his baggage, a case containing no less than thirty pounds of picrate, and had allowed the explosive matter to be stowed in the hold with as little compunction as a Frenchman would feel in smuggling a single bottle of wine."
"Thus incautiousness and incircumspection are included in"
"The eloquent controversialist Bossuet and the Catholics have been careful to avail themselves of the impetuosity and incautiousness of the great German Reformer."