Lack of chastity; the state of being unchaste.(noun)
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Use "unchasteness" in a sentence
"But if this charge is true (that she wasn't a virgin on her wedding night), and evidence of the girls virginity is not found, they shall bring the girl to the entrance of her fathers house and there her townsman shall stone her to death, because she committed a crime against Israel by her unchasteness in her father's house."
"Howsoever the best way is to contemn it, which [6214] Henry II. king of France advised a courtier of his, jealous of his wife, and complaining of her unchasteness, to reject it, and comfort himself; for he that suspects his wife's incontinency, and fears the Pope's curse, shall never live a merry hour, or sleep a quiet night: no remedy but patience."
"But a woman may be perfectly chaste herself, and yet cause a great deal of unchasteness in other people."