a single
A single is a person who’s not married and doesn’t have a partner. They’re free, but sometimes they’re also lonely and sad.
'Why are you single?' 'Because I’m not a loser who needs someone to fix me.'
'He’s single, but he’s not looking.' 'He’s just waiting for someone to take him out.'
'She’s single, and she’s happy.' 'She’s also 32 and still lives with her mom.'