I am a convinced bachelor. Is it right?
I am a convinced bachelor. Is it the right sentence?

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Do you mean a 'confirmed bachelor'?
"in the Victorian era, the term "confirmed bachelor" denoted a man who was resolute to remain unmarried."
- https://en.wikipedia.org/wiki/Bachelor

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Another term used in that sense is "an incorrigible bachelor".
It sounds stronger (and kind of more interesting to me) than "convinced" or "confirmed".

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"confirmed bachelor" is also a euphemism for a gay man