The condition or characteristics of a spinster.(noun)
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Use "old-maidism" in a sentence
"But one can never reckon with real, bred-in-the bone old-maidism."
""It's nothing but a chronic case of old-maidism," said father impatiently."
"There was, indeed, a danger -- his seniors said so -- of his developing into a regular "Auntie Fuss" of an adjutant, and when an officer once takes to old-maidism there is more hope for the virgin of seventy than for him."