spin ‧ ster /ˈspɪnstə $ -ər/ BrE AmE noun [countable] old-fashioned
[ Date: 1600-1700 ; Origin: spinster 'woman who spins' (14-20 centuries) , from spin ]
an unmarried woman, usually one who is no longer young and seems unlikely to marry ⇨ bachelor
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THESAURUS
■ someone who is not married
▪ bachelor a man who has never been married:
He’s a confirmed bachelor (=a man who has decided he will never marry) .
▪ spinster old-fashioned a woman who has never been married and is no longer young:
The house was owned by an elderly spinster.