bachelor
n. countablen. a man who is not married. You use this to describe someone who lives alone or has never had a wife.
n. a man who is not married, especially one who has never been married. Often used in social contexts to describe a man's marital status.
He is a happy bachelor who enjoys living alone.
After years of living as a bachelor, he finally decided to settle down and buy a house with his partner.
The novel explores the life of a confirmed bachelor whose rigid daily routines are suddenly disrupted by the arrival of a distant relative.
From Middle English bacheler, from Anglo-Norman and Old French bacheler (modern French bachelier), from Medieval Latin baccalārius, baccalāris (compare Tuscan baccalare (“squire”)).
Commonly paired with the adjective 'confirmed' to describe a man who intends to stay unmarried.