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Use "unhealthiness" in a sentence
"Their unhealthiness is their soundness, and is what carries conviction."
"More convenient Fernando Po certainly was, but not more healthy, and ever since 1827 it has been accumulating for itself an evil reputation for unhealthiness which is only languishing just at present because there is an interval between its epidemics — fever in Fernando Po, even more than on the mainland, having periodic outbursts of a more serious type than the normal intermittent and remittent of the Coast."
"More convenient Fernando Po certainly was, but not more healthy, and ever since 1827 it has been accumulating for itself an evil reputation for unhealthiness which is only languishing just at present because there is an interval between its epidemics -- fever in"